Question 1 (1 point)Save Question 1Save Which of the following will increase blo
ID: 9749 • Letter: Q
Question
Question 1 (1 point)Save Question 1Save
Which of the following will increase blood flow to a given region of the body?
A smaller pressure gradient between the arteries and that region.
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 of the heart is TRUE?
The heart is directly activated by the somatic nervous system.
The heart muscle is directly activated by the autonomic nervous system.
NE released by sympathetic neurons binds to beta-adrenergic receptors and increases heart rate.
ACh released by parasympathetic neurons binds to nicotinic receptors and decreases heart rate.
Question 3 (1 point)Save Question 3Save
The prolonged depolarization in cardiac myocytes is due primarily to 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 potential generated by the SA node is FALSE?
Its intrinsic rate is about 70 depolarizations per minute.
The rate of depolarization can be affected by autonomic innervation.
Funny (F-type) sodium channels play a role in the gradual depolarization.
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 the right hand column that BEST correspond (one match per term, all selections are used).
The period of the cardiac cycle when the heart is contracting
The period during diastole when the pressure in the atria exceeds the pressure in the ventricles.
The period during systole when all heart valves are closed.
The difference between end-diastolic volume and end-systolic volume.
The period of the cardiac cycle when the heart is relaxing.
1.
Systole
2.
Diastole
3.
Stroke volume
4.
Isovolumetric contraction
5.
Ventricular filling
Explanation / Answer
1. Which of the following will increase blood flow to a given region of the body?An increase in diameter of the arterioles feeding the region.
2. Which of the following statements pertaining to the innervation of the heart is TRUE?
The heart muscle is directly activated by the autonomic nervous system.
3. The prolonged depolarization in cardiac myocytes is due primarily to which channel type?
Long-lasting (L-type) calcium channels
4. Which of the following statements about the pacemaker potential generated by the SA node is FALSE?
The rate of depolarization can be affected by autonomic innervation. 5.
The period of the cardiac cycle when the heart is contracting - systole The period during diastole when the pressure in the atria exceeds the pressure in the ventricles - ventricular filling. The period during systole when all heart valves are closed - Isovolumetric contraction. The difference between end-diastolic volume and end-systolic volume - Stroke volume. The period of the cardiac cycle when the heart is relaxing - diastole
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