anatomy of blood vessels

Question 1

what is stroke volume

Answer 1

the volume of blood pumped out by a ventricle with each heartbeat, increases as the force of ventricular contraction increases, 70ml per beat, factors that influence SV- preload- stretch of cardiac muscles, contractility-ability to generate force, afterload-force on semilunar valves that ventricles must overcome to pump blood

Question 2

systole

Answer 2

contraction phase of heart activity

Question 3

diastole

Answer 3

period between contractions of relaxation phase of heart

Question 4

cardiac cycle

Answer 4

one complete heartbeat, which both atria and ventricles contract and relax (0.8 secs)

Question 5

what is Lub-dub heart sound

Answer 5

ub-closing of AV valve, dub-semilunar valves close

Question 6

apex

Answer 6

part of heart to use stethoscope to hear heart

Question 7

what is cardiac output

Answer 7

amount of blood pumped out by each ventricle in 1 minute,product of heart rate and stroke volume

Question 8

what are things that modify heart rate

Answer 8

ANS (anatomical nervous system) controls (parasympathetic, sympathetic), Hormones and ions (epinephrine,thyroxine,calcium), physical factors (age,gender,exercise)

Question 9

what’s the vascular system

Answer 9

system of closed blood vessels

Question 10

what are arteries

Answer 10

vessel that carries blood away from the heart

Question 11

what are veins

Answer 11

vessel that carries blood away from tissue and towards the heart