Physiology 1 Flashcards
What is a means to delivering the correct flow of blood?
Pressure
What controls the regulation of the heart?
The heart itself - it is autonomous
Which nervous system branch is of main interest regarding autonomic control of blood vessels?
Sympathetic Nervous System
What percentage of circulatory blood is present in the heart?
7%
What percentage of circulatory blood is present in the pulmonary circulatory system?
9%
What percentage of circulatory blood is present in the systemic circulatory system?
84%
Why does the left ventricle consist of more muscle than the right ventricle?
The left ventricle pumps blood to the entire systemic circulatory system
What percentage of blood is forcibly pumped (not drained) from the atrium into the ventricle before contraction?
10-20%
What is an elastic property of arteries which allows them to maintain their shape?
Elastic recoil
What is the meaning of the term path of resistance?
The route which has the least resistance will take the most blood
What is a parallel arrangement?
The blood vessels are arranged in parallel so that different quantities of blood can be directed to different organ systems to meet demands. Controlled by ‘resistance’ or in other words nervous system constricting or dilating blood vessels
What anatomical features ensure the heart is a one way system?
Valves
What is the role of papillary muscles?
To keep valves closed
Do valves open actively with the help of muscles or passively?
Passively
Is all the blood from the ventricles ejected upon contraction?
No, only a potion of it
