second half of final exam Flashcards
3 functions of the cardiovascular system
Supplies muscles and organs with O2 and nutrients
Removes metabolic by-products from tissues
Critical for performance
Enhanced by training
what are the 3 layers of the heart?
- endocardium
- myocardium
- epicardium
function of the endocardium
(within)
- Lines heart chambers
- Allows smooth blood flow
function of the myocardium
(middle)
- Thick and muscular
- Pumps blood
- Heart muscle itself
function of the epicardium
(upon)
- Thin
- Protection
function of the pericardium
(around) -Protective sac containing pericardial fluid (reduces friction) -Loosely surrounds heart -Reduces friction
function of the ventricles
pump blood to the body
function of the right ventricle
-Deoxygenated blood to lungs via pulmonary artery
function of the left ventricle
-Oxygenated blood to body via aorta
function of the atria
pumps blood into ventricles
function of the right atrium
-Deoxygenated blood from body via superior/inferior vena cava
function of the left atrium
- Oxygenated blood from lungs via pulmonary vein
- Only vein that carries oxygenated blood
function of semilunar valves
- Open when ventricles contract to direct blood flow into arteries
- Close when ventricles relax to prevent backflow of blood
what are the 2 semilunar valves?
Pulmonary valve
Aortic valve
function of the pulmonary valve
connects the right ventricle to the pulmonary artery
function of the aortic valve
connects the left ventricle to the aorta
what is the function of the atrioventricular valves
- Open when atria contract to direct blood flow into ventricles
- Close when atria relax to prevent backflow
what are the 2 different atrioventricular valves?
Tricuspid valve
Bicuspid / mitral valve
function of the tricuspid valve
connects the right atrium to the right ventricle
function of the bicuspid/mitral valve
connects the left atrium to the left ventricle
what is the sinus node (sinoatrial node)
Bundle of nerve fibres that control heart rate
Called the “pacemaker of the heart”
where is the sinus node located?
Located inside right atrium wall
what is the function of the sinus node?
Generate a nerve impulse (action potential)
Cause muscle walls to contract
Atria 1st, ventricles 2nd
what are the 2 components of blood pressure?
- systolic blood pressure
- diastolic blood pressure
systolic blood pressure
- During ventricular contraction (systole)
- How hard the heart works
- Strain against arterial walls during contraction
what is normal for systolic bp
120 mm Hg
diastolic blood pressure
- During heart relaxation (diastole)
- Indicates peripheral BP (outside the heart)
- Ease with which blood flows from arterioles to capillaries
what is normal for diastolic bp
70-80 mm Hg
cardiac output
- The amount of blood pumped into the aorta each minute
- Representative of the quantity of blood flowing to peripheral circulation
stroke volume
- Amount of blood (ml) pumped out of left ventricle per heartbeat
- Resting: 70 ml
define heart rate. What is considered resting heart rate and what is considered the max heart rate?
-Rhythmical contraction of the heart walls (beats per minute, bpm)
Resting: 40-70 bpm
Maximum: 220 – age (years)
what are the 3 functions of the peripheral circulatory system?
Consists of blood vessels made up of layers of tissue
Smooth muscle cell layer allow vessels to contact
This regulates blood flow throughout the body
Arteries carry blood _____ from the heart while
veins carry blood _____ the heart
away, towards
Small vessels that branch from arteries
arterioles
capillaries
Tiny vessels that branch from arterioles
Allow O2 and nutrient exchange; waste and CO2 removal
Small vessels that branch from veins
venules
what are the 4 components of blood?
plasma, platelets, white blood cells, red blood cells
1) infection fighting cells (leukocyte)=?
2) transport fluid=?
3) oxygen-carrying cells (erythrocyte)=?
4) clot-forming component=?
association: red blood cells, plasma, platelets, white blood cells
1) white blood cells
2) plasma
3) red blood cells
4) platelets
Most abundant cell type in blood
red blood cells
what do we call the percentage of blood made up of RBCs (usually 45% of blood volume)
hematocrit
Protein and iron molecule inside RBCs that binds to up to four O2
hemoglobin
partial pressure of O2
Determines hemoglobin-oxygen binding High pressure (e.g., lungs): O2 binds Low pressure (e.g., muscle): O2 unbinds
arterial-venous oxygen difference
Difference between O2 level in blood leaving and returning to the lungs
Measure of O2 being used by the body tissues
Rest: 4-5 ml O2 /decilitre blood
Exercise: 15 ml O2 /decilitre blood
reticulocytes
Immature RBCs with more hemoglobin
Produced in bone marrow (red marrow of large bones)
Tightly controlled with a hormone erythropoietin (EPO) produced by the kidneys
order of transport of CO2
tissues, blood, lungs, then air
the transport of CO2 is useful for what?
Helps regulate body’s:
- Ionic equilibrium (chloride shift)
- pH balance (bicarbonate)
explain the 3 different ways CO2 is transported to the lungs
1) 10% is dissolved in plasma
2) 20% is combined with hemoglobin to form carbaminohemoglobin
3) 70% binds with hemoglobin and is then transported in plasma
what are the 2 factors affecting O2 delivery and uptake?
1) central component: amount of O2 delivered by the cardiovascular system
2) peripheral component: amount of O2 extracted by skeletal muscles
factors affecting O2 delivery
1) Cardiac output
Amount of blood pumped by the heart each minute (into the aorta)
Determines O2 volume delivered to tissues
2) Hematocrit
Concentration of red blood cells
Determines amount of O2 per a volume of blood
factors affecting O2 uptake
1) O2 extraction
Ability of tissues to extract O2
Affected by mitochondria number and enzyme efficiency
2) Capillarization
Number of capillaries in tissue
Affects the ability of cardiovascular system to place RBCs close to the working tissues
3 main functions of the respiratory system
Delivers oxygenated air to blood
Removes CO2 from blood
Regulates acid-base balance
what are the 2 zones within the lungs and what are their function?
Conduction zone: filters, humidifies and adjusts air to body’s temperature
Respiratory zone: gas exchange
The alveolar duct, alveolar sac, alveolus, and alveolar capillaries are all part of the ________ zone of the lungs
respiratory zone
The trachea, right bronchus, bronchioles, left bronchus, and terminal bronchiole are all part of the _______ zone of the lungs
conduction zone
what are the 3 aspects of respiration?
ventilation, gas exchange (via diffusion), and oxygen utilization
ventilation in the respiratory system is achieved by __________ and _________.
thoracic diaphragm and intercostal muscles
where does gas exchange occur in the respiratory system?
Between air and blood (at alveoli)
Between blood and other tissue
The cardiorespiratory system adjust to the demands of exercise to ensure what 2 things?
That there is an adequate supply of blood (and O2) that reaches brain, heart and muscles
That heat and waste produces generated by muscles are dissipated and removed
What happens to your cardiac output while exercising?
ventricle size, stroke volume, wall thickness, etc.
- increased atria and ventricles size
- increased amount of blood pumped per heart beat (stroke volume)
Wall thickness
- increased rate of contraction
- increase in ventricles emptying
Result:
- increase in maximal cardiac output
- increase in pumping efficiency
what happens to your capillary supply while exercising?
-increase the number of muscle capillaries and their blood flow
- increased surface area and decreased distance between blood and tissues
- increased O2 and CO2 diffusion
- more transport of nutrients
-more O2 extraction
what happens to your blood volume while exercising?
1) -increased number of RBCs
- increased erythropoiesis (formation of new RBCs) in bone marrow
2) -increase in total blood volume
- increased O2 amount extracted
- increased O2 carrying capacity
how does exercise affect our ventilation process?
- increase breath depth
- increase breathing rate
- more gas exchange
- 150 L/min vs. 6 L/min at rest
what are the immediate effects of PA in high altitudes?
1) Hyperventilation (immediate)
- increased breathing rate
- increased O2 delivery
- increased CO2 removal and acid-base balance changes
2) increased heart rate (immediate)
what are the long term effects of PA in high altitudes?
increased O2 carrying capacity (long-term)
* More RBCs * More Hb per RBC
___% of energy is released through heat
80
Victorians used ______ explanations to justify ______ differences between women and men
biological, cultural
Many (but not all) of our current sports come from ______________, where they were played by ‘gentleman amateurs’ = “Sportsmanship”
late 19th century Britain
Sport was modernized through 5 things:
- written rules
- regulated spaces and times
- organized competitions
- international diffusion
- creation of national teams/ international governing bodies
was what the main focus of sport in the indigenous communities?
focused around ceremonial and religious practices and teaching of survival skills
What impact did the industrial revolution have on sport?
it increased leisure time and engagement in sport and games because people worked in more urban areas instead of moving around so they had more spare time
What values were promoted by these clubs and associations created by the Brits?
- Pleasure and conviviality
- Excellence in competition
- Skill—‘scientific play’—rather than brute strength
- Respectable ‘manliness’—courage, self-reliance and self-discipline, respect for others
- Canadian nationalism (pro-British variant)
- Sports as education for citizenship
when did the emergence of women’s sport begin? what kind of exercise did this comprise of? what was the goal of this?
- Begun predominantly in 1880s
- Light exercise concentrated on making women both strong and graceful
- Goal: protecting women, based on the assumption that they were weak, fragile
explain the effect of the bicycle craze on women and sport in the 1890’s
- Invention of the pneumatic tire and the safety bicycle
- Mass production
- Revolutionary impact on women’s access to physical activity
- Aided by the introduction of the “bloomer”, bifurcated skirt
what was the main reason in the 19th century that it was not acceptable for women to participate in sport?
- fears were that a woman should not run too fast or jump too high because her uterus might fall out
- ”weaker” sex needs to conserve their energy
when was the first time women were allowed to compete a the Olympic games? what sport did they compete in?
Women competed at Paris, 1900 for the first time, women were allowed to play tennis
what political changes were said to have an impact on women and sport and why?
- Suffragette movement (women winning the vote)
- Prohibition (importation of alcohol)
- Person’s Case (1929) (women allowed in the senate)
- Connection to sport and physical activity?
-because women are now allowed to work in factories and are considered people
Who is Fanny (Bobby) Rosenfeld?
-Gold and silver medals in track and field, 1928 -Olympics
-Hockey and softball star
-Journalist at the Globe and Mail
-Named Canada’s female athlete of the half century in 1950
(pretended to be a guy so she could compete)
Celebrated Women’s Teams: Preston Rivulettes
women’s hockey team:
348 wins – 2 losses
8 consecutive Ontario championships
6 consecutive national titles
What was the most successful team in Canadian sport history and what did they accomplish?
The Edmonton Grads- women's basket ball team: 502 wins – 20 losses (1915-1940) 18 consecutive Canadian titles 17 consecutive North American titles Winning streaks of 147 and 78 games
women organizing sport for women: Alice Milliat’s accomplishments
-Created an international federation:
Fédération Sportive Féminine Internationale (FSFI)
-Hosted women’s only international games
what was included for women at the 1928 Olympics
- IOC agrees to add women’s track and field events to the program for Amsterdam 1928
- FSFI fought for 12 events
- Final IOC program included five events: 100m, 800m, high jump, discus, 4 x 100m relay
- 12.8% of all Olympic events were for women
- Women comprised 9.6% of competitors
How did the group “Matchless six” do at the 1928 Olympics?
- gold in high jump (Ethel Catherwood)
- gold (WR) in 4 x 100 m relay
- silver (Fanny “Bobbie” Rosenfeld) and bronze (Ethel Smith) in 100m
- unofficial team points championship
why was the women’s 800m race removed from the Olympics in 1928? when was this reincluded in the Olympics and when was the first women’s marathon?
- Competitors fell to the infield grass, at the conclusion of the 800m
- Male observers, including Coubertin and Pope Pius (who commented on the event from Rome), were aghast at such “un-feminine” display
- removed from the Olympic program and women did not run that far again until 1960
- Women’s marathon refused until 1984
Did the impact created by the inclusion of women in the Olympics last? Why or why not?
- Wartime mobilization (beginning in 1939) closed facilities to women’s teams
- Post-war reconstruction emphasized household responsibilities
- Many institutions discontinued girls’ and women’s competitions
- Example of the first wave’s achievements lost to the next generation
Biomechanics
the science that examines the forces acting upon (external) and within (internal) a biological structure and the effects produced by such forces
Biomechanics is an interdiscipline of what 6 disciplines?
- health sciences
- kinesiology
- medicine
- mathematics
- engineering
- natural sciences
quantitative analysis
Using high-tech instrumentation
Usually intended for researchers
Measuring variables to optimize athletic performance
qualitative analysis
Using sight and hearing
Usually done by coaches and teachers
Who typically do not have access to complex equipment or specialized knowledge
To identify and correct errors: “Observe, analyze and correct.”
Requires framework and a set of principles
what is the difference between kinetics and kinematics?
Kinematics: without reference to forces causing motion
Kinetics: describing motion in terms of forces that cause it
what is the main focus of kinematics?
Focusing on motion’s spatial and timing characteristics
Measurements: Position Displacement Velocity Acceleration
what is the main focus of kinetics?
Internal forces
Muscles pulling on bones
Bone-on-bone, inside joints
External forces acting on the body
Without contact (e.g., gravity)
From contact with ground, opponent or equipment
what are the 3 models that simplify the study of human movements?
Particle model
Stick figure model
Rigid body segment model
what is the particle model?
- dots represent the center of mass
- used when body or object are airborne or in flight
- ex: projectile motion
what is the stick figure model?
- body segments represented as sticks
- used when body is in contact with other objects
- describes gross motor skills in 2D
what is the rigid body segment model?
- body segments=irregular 3D volume
- used for sophisticated 3D analyses
- can include shape deformation of body segments
Mass
- Quantity of matter in an object
- Reluctance of an object to change state of linear motion
- A measure of linear inertia
Moment of inertia
- Reluctance of rotating object to change state of angular motion (rotation)
- Depends on mass and its distribution around axis of rotation