Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
20 Cards in this Set
- Front
- Back
|
in mammals what is the mass transport system? why is it used |
circulatory system - where the blood is used to transport substances around the body |
|
|
how do individual cells in tissues and organs get by the blood |
nutrients and oxygen and metabolic waste |
|
|
where does the right side pump to and what type of blood does it pump |
deoxygenated blood to the lungs |
|
|
where does the left side pump to and what type of blood does it pump ? |
oxygenated blood to the whole body |
|
|
why is left ventricle thicker than the right |
it needs to contract powerfully to pump blood all around the body. the right side only needs to pump to the lungs |
|
|
why do the ventricles have thicker walls than the atria? |
ventricles push blood out of the heart. atria need to push blood a short distance |
|
|
role of the atrioventricular valves (av) |
- to link the atria to the ventricles - stop back flow into the atria when the ventricles contract
|
|
|
role of the semi lunar valve |
- link ventrviles to pulmonary artery and aorta - stop back flow into the heart after the atria contract |
|
|
role of cords? |
- attach av valves to v - to stop them being forced up into the atria when the v contract |
|
|
process of the left side |
pulmonary vein ---> left atrium ---> left av valve-->left ventricle ---->semi lunar valve ---> aorta |
|
|
process of the right side |
superior/inferior venacava---> right atrium----> right av valve----> right ventricle ---> semi lunar valve ----> pulmonary artery |
|
|
why do valves only open one way ? |
to prevent back flow |
|
|
what happens when their is high pressure behind the a valve |
it is forced open |
|
|
what happens when there is high pressure in front of the valve ? |
it is forced shut |
|
|
where do arteries carry blood to ?
|
from heart to the rest of the body |
|
|
4 factors that allow the artery walls to cope with high pressure |
thick walled. muscular. elacstic tissue. inner lining (endothelial wall) is folded - to expand |
|
|
where do the veins carry blood |
back to the heart |
|
|
Name 3 factors that allow the blood to flow back to the heart |
wider. valves - prevent back flow. contarction of body muscles. |
|
|
what occurs in the capillaries |
metabolic exchange- substances exchanged between cells and capillaries |
|
|
2 factors allowing this metabolic exchange in the capillaires |
- capillary bed(networks of capillaries) in the tissue----> inc of s.a. - 1 cell thick ----> speeds up diffusion of substances |
