heart Flashcards
1
Q
Explain the role of the heart in the formation of tissue fluid
A
contraction of ventricles produces a high blood pressure/ hydrostatic pressure
this forces water and some dissolved substances out of the blood capillaries
2
Q
high blood pressure=
A
hydrostatic pressure
3
Q
Explain four ways in which the structure of the aorta is related to its function
A
- elastic tissue to allow stretching and recoil, smoothes out floe of blood/ maintains pressure
- elastic tissue - stretches when ventricles contract and recoils when ventricles relax
-muscle for contraction/ vasoconstriction - thick wall - withstands pressure and stops bursting
- smooth endothelium reduces friction
aortic valve, semi lunar prevents backflow
4
Q
what causes difference in pressure in left ventricle
A
left ventricle thicker wall
beats strongly/ more forcefully
5
Q
transport system is required..
A
is required to take material to take materials from cells to exchange surfaces and from exchange surfaces and from exchange surfaces and the environment
6
Q
mammals have a…
A
closed, double circulatory system
