Question 6 (1 point)Save Question 6Save When end-diastolic volume is increased,

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Question 6 (1 point)Save Question 6Save
When end-diastolic volume is increased, the force of the myocardial contraction is increased. This is due to _________?

a shift in the operating point of the myocardial length-tension curve

an increased release of calcium

stretch-induced parasympathetic activity

a decreased afterload in the arteries
Question 7 (1 point)Save Question 7Save
Match the vessel characteristic on the left with the appropriate vessel type on the right (each vessel type will be used more than once, only 1 BEST answer for each characteristic).

Substance exchange with the tissues takes place in these vessels

These vessels are the main site of vascular resistance

Active hyperemia directly affects the diameter of these vessels

Very low resistance vessels that act as a pressure-reservoir due to their elasticity

These vessels contain one-way valves throughout their length

The walls of these vessels are composed of a single layer of endothelial cells and a thin basement membrane

Very low resistance vessels that serve as a volume reservoir due to their compliance

The velocity of blood flow is the least in these vessels

These vessels carry blood back to the heart

Blood flow in these vessels is directly aided by the skeletal muscle pump

The total cross-sectional area of this type of vessel (cross-sectional area of all these vessels combined) exceeds the total cross-sectional area of every other type of blood vessel

These are the first vessels that carry blood away from the heart

1.
Arteries
2.
Arterioles
3.
Capillaries
4.
Veins
Question 8 (1 point)Save Question 8Save
Which of the following selections correctly completes the statements: The primary mechanism via which gasses (oxygen and carbon dioxide), ions, and nutrients are exchanged between the capillaries and the tissue is ______.

Diffusion

Active transport

Bulk flow

More than one of the above is correct.
Question 9 (1 point)Save Question 9Save
Which of the following changes will favor an increase in absorption at the capillaries?

An increase in plasma osmolarity.

An increase in interstitial fluid osmolarity.

An increase in capillary fluid hydrostatic pressure.

A decrease in interstitial fluid hyrdrostatic pressure.

More than one of the above selections is correct.
Question 10 (1 point)Save Question 10Save
Correct order the following events that would occur due to a drop in MAP.

Sympathetic activation increases and parasympathetic activation decreases

Heart rate, stroke volume, cardiac output, and total peripheral resistance increase.

MAP rises.

Baroreceptor firing decreases

Explanation / Answer

6. When end-diastolic volume is increased, the force of the myocardial contraction is increased. This is due to a shift in the operating point of the myocardial length-tension curve
7. Substance exchange with the tissues takes place in these vessels-capillaries These vessels are the main site of vascular resistance-arterioles
Active hyperemia directly affects the diameter of these vessels-arterioles
Very low resistance vessels that act as a pressure-reservoir due to their elasticity-artery
These vessels contain one-way valves throughout their length-veins The walls of these vessels are composed of a single layer of endothelial cells and a thin basement membrane-capillaries
Very low resistance vessels that serve as a volume reservoir due to their compliance-veins
The velocity of blood flow is the least in these vessels-capillaries
These vessels carry blood back to the heart-veins
Blood flow in these vessels is directly aided by the skeletal muscle pump-veins
The total cross-sectional area of this type of vessel (cross-sectional area of all these vessels combined) exceeds the total cross-sectional area of every other type of blood vessel-capillaries
These are the first vessels that carry blood away from the heart-capillaries --------------------------------- --------------------------------- 8. The primary mechanism via which gasses (oxygen and carbon dioxide), ions, and nutrients are exchanged between the capillaries and the tissue is __diffusion____.
9. Which of the following changes will favor an increase in absorption at the capillaries? An increase in plasma osmolarity 10. Correct order the following events that would occur due to a drop in MAP:
MAP drops--->Baroreceptor firing decreases--->Sympathetic activation increases and parasympathetic activation decreases---->Heart rate, stroke volume, cardiac output, and total peripheral resistance increase---->MAP rises.

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