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EXSC 224 Final Exam Questions with 100% Correct Answers | Latest Update
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EXSC 224 Final Exam Questions with 100% Correct Answers | Latest Update Which tunic of an artery is most responsible for maintaining blood pressure and continuous blood circulation? - tunica media Cardiac muscle cells are like skeletal muscle cells in that they have ________. - I and A bands ...

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  • December 23, 2024
  • 39
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • EXSC 224
  • EXSC 224

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EXSC 224 Final Exam Questions with

100% Correct Answers | Latest Update


Which tunic of an artery is most responsible for maintaining blood pressure

and continuous blood circulation? - ✔✔tunica media

Cardiac muscle cells are like skeletal muscle cells in that they have

________. - ✔✔I and A bands

The tricuspid valve is closed when the ventricle is in __________. -

✔✔systole

Fred's blood was determined to be AB positive. What does this mean? -

✔✔there are no antibodies to A, to B, or to Rh antigens in the plasma.

What is the average normal pH range of blood? - ✔✔7.35-7.45

What component of blood is responsible for the initiation of the blood

clotting process? - ✔✔platelets

The source of blood carried to capillaries in the myocardium would be the

________. - ✔✔coronary arteries




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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.

,When are the atria and ventricles simultaneously in systole? - ✔✔They

aren't

If the vagal nerves to the heart were cut, the result would be that

_________. - ✔✔the heart rate would increase by about 25 beats per

minute.

Compared to skeletal muscle, cardiac muscle ________. - ✔✔has no gap

junctions that allow it to act as a functional syncytium.

During periods of ventricular filling ___________. - ✔✔blood flows mostly

passively through the atria and the open AV valves into the ventricles.

Norepinephrine acts on the heart by _________. - ✔✔causing threshold to

be reached more quickly

Blood within the pulmonary veins returns to the ________. - ✔✔left atrium

What organ in the body regulates erythrocyte production? - ✔✔kidney

What is isovolumetric contraction? - ✔✔the short period during ventricular

systole when the ventricles are completely closed chambers.

85% of Americans carry the ______ Rh agglutinogen on their RBCs. -

✔✔D

A blood vessel that contains one-way valves is known as _____. - ✔✔a

vein
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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.

,A lack of intrinsic factor, leading to a deficiency of vitamin B12 and causing

an appearance of large pale cells called microcytes, is a characteristic of

___________. - ✔✔pernicious anemia

If we were able to artificially alter the membrane permeability of pacemaker

cells so that sodium influx is more rapid, ________. - ✔✔threshold is

reached more quickly and heart rate would increase.

Factors that aid venous return - ✔✔1. sympathetic nerve activity that

stimulates smooth muscle contraction in the venous walls and reduces

compliance

2. skeletal muscle pump, which squeezes veins during muscle contraction

3. pressure difference between the thoracic and abdom. cavities which

promotes the blood of venous blood back to the heart.

4. respiratory pump

The arteries that directly feed into the capillary beds are called ________. -

✔✔arterioles

Jenny was studying for EXSC 224 exam when a friend came up from

behind and startled her causing her heart rate to increase due to an

increase in sympathetic activity. the sympathetic nervous system increased




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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.

, Jenny's heart rate primarily by _________. - ✔✔causing threshold to be

reached more quickly

An incompetent valve increases the stress on the heart because

___________. - ✔✔the valve leaks and a portion of the blood pumped

must be pumped twice.

During what phase of the cardiac cycle does intraventricular pressure rise

and the pulmonary valve is open? - ✔✔ventricular ejection

Site where blood pressure is lowest - ✔✔large veins

Site where exchanges of food and gases are made - ✔✔capillaries

Sites where resistance to blood flow is greater - ✔✔arterioles

Site that us the major determinant of peripheral resistance - ✔✔arterioles

Site where the blood pressure is greatest - ✔✔large arteries

List and define the three most important factors that affect stroke volume. -

✔✔1. Preload- the degree to which heart muscle cells are stretched before

they contract.



2. Contractility- contractile strength achieved at given muscle length.




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©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.

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