The Cardivascular System (P1) Flashcards
What is the Arterio-Venous Difference?
The difference between the oxygen content of the arterial blood arriving at the muscles and the venous blood leaving the muscles.
When is their a high arterio venous difference and when is their a low difference ? And why?
There is a high difference during exercise because more oxygen is needed from the blood for muscle contractions. There is a low difference during rest because as not much oxygen is required by the muscles.
How does a high difference in the Arterial-Venous Difference affect gaseous exchange?
This affects gaseous exchange at the alveoli as more oxygen is taken in and more carbon dioxide is removed.
How is oxygen transported? As a percentage.
97% is transported with haemoglobin in oxyhemoglobin.
3% with blood plasma
What is haemoglobin and myoglobin?
An iron containing pigment found in the red blood cells.
Myoglobin is the ‘muscle haemoglobin’. An iron containing muscle pigment in slow twitch muscle fibres which has a higher affinity for oxygen than haemoglobin.
.When partial pressure (concentration) of oxygen is high e.g in the lungs how many molecules of oxygen can a haemoglobin molecule carry?
.When partial pressure is low e.g in muscle tissue what happens to oxygen molecules?
. What is this called ?
.4 molecules
. Oxygen is released from oxyhaemoglobin
. Oxyhaemoglobin association/dissociation curve
Where does the oxygen go when it dissociates from haemoglobin?
Myoglobin takes oxygen away from haemoglobin into the muscle cell and stores it until it is needed by the mitochondria for aerobic respiration and energy production.
Who has large amounts of myoglobin and mitochondria and why?
Endurance athletes as a result of training.
What is the oxyhaemoglobin dissociation curve?
It helps us to understand how haemoglobin in our blood transports and releases oxygen. The curve shows the relationship between oxygen and haemoglobin.
What is a Bohr Shift?
During exercise, the s-shaped curve shifts to the right because when muscles require more oxygen, the dissociation of haemoglobin in blood capillaries to the muscle tissue occurs more readily.
What are the four reasons why a Bohr shift occurs?
- Increase in blood and muscle temperature during exercise
- Decrease in the partial pressure of oxygen- muscles use more oxygen to provide energy
- Increase in the partial pressure of carbon dioxide- muscles produce more carbon dioxide as a by-product.
- Lower pH- The increase in lactic acid/increased co2 in muscles/blood acidity
What is the vascular shunt mechanism?
The redirecting of blood to the areas that most need it. During exercise the skeletal muscles require more oxygen so more blood needs to be redirected to them.
What may occur if a performer eats less than an hour before exercise?
A full gut would result in more blood being being directed to the stomach instead of the working muscles .
What is the cardiovascular system?
The body’s transport system.
In the heart, what does the dual action pump do?
Pumps blood to two destination. Heart and lungs.
What does the right side of the heart do?
Pumps deoxygenated blood towards the lungs.
What does the left side of the heart do?
Pumps oxygenated blood towards the body.
What is the name of the mucular wall that seperates the two chambers?
The septum.
Each half contains two chambers which are called….
which are bigger?
Atrium and ventricles. Ventricles are bigger
What does the atria do?
Atria push blood down into the ventricles which does not require much force so they have thinner muscular walls.
What do ventricles do?
They have thicker muscular walls so they need to contact with more muscular force to push blood out of the heart.
What do the superior/inferior vena cava do?
Carry deoxygenated blood from the body to the right atrium.
What does the pulmonary vein do?
Carries oxygenated bloodfrom the lungs to the left atrium.
What does the aorta do?
Carries oxygenated blood from the left ventricle to the whole body.