Question 1 (1 point)Save Question 1Save
Which of the following will increase blood flow to a given regionof the body?
A smaller pressure gradient between the arteries and thatregion.
Vasoconstriction of the arterioles feeding that region.
An increase in blood viscosity via dehydration.
An increase in diameter of the arterioles feeding the region.
Question 2 (1 point)Save Question 2Save
Which of the following statements pertaining to the innervation ofthe heart is TRUE?
The heart is directly activated by the somatic nervoussystem.
The heart muscle is directly activated by the autonomic nervoussystem.
NE released by sympathetic neurons binds to beta-adrenergicreceptors and increases heart rate.
ACh released by parasympathetic neurons binds to nicotinicreceptors and decreases heart rate.
Question 3 (1 point)Save Question 3Save
The prolonged depolarization in cardiac myocytes is due primarilyto which channel type?
Voltage-gated sodium channels
Voltage-gated potassium channels
Funny (F-type) sodium channels
Long-lasting (L-type) calcium channels
Question 4 (1 point)Save Question 4Save
Which of the following statements about the pacemaker potentialgenerated by the SA node is FALSE?
Its intrinsic rate is about 70 depolarizations per minute.
The rate of depolarization can be affected by autonomicinnervation.
Funny (F-type) sodium channels play a role in the gradualdepolarization.
In the complete absence of extrinsic input (hormones or neurons),the SA node will continue to depolarize
Question 5 (1 point)Save Question 5Save
Match the description in the left hand column with the terms in theright hand column that BEST correspond (one match per term, allselections are used).
The period of the cardiac cycle when the heart is contracting
The period during diastole when the pressure in the atria exceedsthe pressure in the ventricles.
The period during systole when all heart valves are closed.
The difference between end-diastolic volume and end-systolicvolume.
The period of the cardiac cycle when the heart is relaxing.
1.
Systole
2.
Diastole
3.
Stroke volume
4.
Isovolumetric contraction
5.
Ventricular filling