Cardiovascular + Respiratory Systems Flashcards
What are the two main organs of the cardiovascular system
Heart and blood vessels
What are the three functions of the cardiovascular system
Regulation, protection and transportation
What is being transported in the cardiovascular system
O2, CO2, minerals, waste, hormones, glucose
What regulations are being held in the cardiovascular system
Temperature, PH, fluid volume, blood pressure
What is being protected in the cardiovascular system
Blood loss and infection
What is the specific role of the heart
Pumps blood around the body
What is the specific role of the blood vessels
Tubes carrying the blood
What tubes carry blood
Arteries and arterioles, veins and venules, capillaries
What tubes carry blood away from the heart
Arteries and arterioles
What tubes carry blood towards the heart
Veins and venules
Where does most diffusion of nutrients take place
Capillaries
What is the role of blood
Transport, regulation, protection
What is pulmonary circulation
Blood travelling to and from the lungs
What is the direction of blood flow in the pulmonary circulation
Heart to arteries to lungs to veins to heart
What is systemic circulation
Blood travelling to everywhere in the body besides the lungs
Direction of blood flow in the systemic circulation
Heart to aorta to superior and inferior body parts to vena cava to heart
What body cavity is the heart in
Thoracic mediastinum
What are the blood vessels in the pulmonary circuit
Veins and arteries
What are the blood vessels in the systemic circuit
Superior vena cava, inferior vena cava, aorta
What are the blood vessels In the cardiac circulation
Arteries and veins
What is myocardial infarction
A blockage in the coronary artery
What is happening during a myocardial infraction
The cells are not getting enough oxygen and nutrients they begin to die which means the heart can no longer efficiently pump blood
What is the pericardium
It’s what surrounds the heart, it’s made of two serous membranes (visceral and parietal)
What do the pericardium serous membranes do
They reduce friction
What are the four chambers in the heart
Right and left atrium and right and left ventricle
What is the atrium for
Receiving
What is the ventricle for
Discharging
Where is the atrium pump blood
To the ventricles
Where do the ventricles pump blood
To the lungs and the body
Where is the atrioventricular valves found
Separates the Atrium from the ventricle
What atrioventricular valve separates left atrium from the left ventricle
Bicuspid
What atrioventricular valve separates right atrium from right ventricle
Tricuspid
How are the atrioventricular valves attached to the heart
Uses chordae tendinae
Where are the semi lunar valves found
Separating the ventricle from the aorta and the ventricle from the artery
Which semi lunar valve separates left ventricle from aorta
Aortic
Which semilunar valve separates the right ventricle from the pulmonary artery
Pulmonary
What are the heart walls made up of
Muscle tissue
The atria’s are separated by what septum
Interatrial septum
The ventricles are separated by what septum
The interventricular septum
What is the contraction of the heart called
Systole
What is the relaxation of a heart called
Diastole
What are the four steps of a heartbeat
- Ventricular filling
- Isovolumetric contraction
- Ventricular ejection
- Isovolumetric relaxation
What happens during ventricular filling (step 1)
Starts with all the chambers relaxed, The atriums receive blood Then the blood is pumped into the ventricles
What happens during isovolumetric contraction (step 2)
Ventricles are beginning to contract, All valves are closed
What is happening during ventricular ejection (step 3)
Contraction of the ventricles pumps blood into the lungs and the body, at the same time the atriums relax
What is stroke volume
The volume of blood ejected from the ventricles during each beat
What is cardiac output
The volume of blood pumped by one ventricle per minute
What is happening during isovolumetric relaxation (step 4)
The ventricles begin to relax and the heart is ready to start the next cycle
What is the role of heart valves
They prevent blood from flowing in the wrong direction
What are heart murmurs
Abnormal sounds heard in the heart
What does the swishing sound mean after the beat
Means the blood flows backwards
What does the swishing sound before the beat mean
The valves don’t open completely
What is the order in which blood flows through blood vessels
Arteries to arterioles to capillaries to venules to veins
What do arteries do
Transport large volumes of blood under high pressure
What do arterioles do
Control circulation of blood to tissues
What do capillaries do
Transport small volumes of blood close to cells
What do venules do
Receive nutrients
What do veins do
Transport large volumes of blood under low pressure
What are similarities between arteries and veins
They both have three layers, Those three layers are all made the same
What are differences between arteries and veins
The arteries tunica media is thicker and veins have a one-way valve
What are the three layers of arteries and veins in order
Tunica externa, tunica media, tunica intima
What is arteriosclerosis
Hardening of the arteries, reduces blood flow
How is arteriosclerosis caused
Buildup of fatty deposits causing the walls to become calcified
What Is total peripheral resistance
How much the blood vessels resist the flow of blood
What is being nourished by Capillery beds
Tissues and organs
What is the function of capillaries
Nutrient exchange
What is the blood flow in capillary beds controlled by
Arterioles and precapillary sphincters
Dilation of arterioles will do what to the Capillery bits
They will allow and block blood from entering
When precapillary sphincters contracts they do what
Blocking blood flow into the capillary beds
When your body wants to lose heat what is happening
The precapillary sphincters open to allow blood into the dermis
What are the precapillary sphincters doing when your body wants to conserve heat
The precapillary sphincter is close to prevent blood from entering the dermis
What are the three receptors in the blood vessels
Chemoreceptors (chemicals), barroreceptors (pressure), Thermoreceptors (temp)
What are the two major factors that influence blood pressure
Toto peripheral resistance and cardiac output
When cardiac output is increased blood pressure is
Increased
When total peripheral resistance is decrease the blood pressure is
Decreased
what is an intrinsic conduction system
it’s the system that uses SA and AV nodes, AV bundle and purkinje fibers. this system is the pacemaker of the heart and can also be modified by the brain, this system sends signals