68W MODULE 1 UPDATED TEST PAPER
2026 QUESTIONS AND CORRECT ANSWERS
FULL SOLUTION GRADED A+
⩥ Which of the following vessels has the thickest muscular walls that
allow constriction and dilation?
A) Arteries
B) Capillaries
C) Veins
D) Lymphatic vessels. Answer: Answer: A
Explanation: A) CORRECT. Arteries have the thickest muscular walls to
allow for vasoconstriction and vasodilation.
B) INCORRECT. Capillaries are thin walled vessels without muscles.
C) INCORRECT. Veins have muscular walls, but are not as thick as
arteries.
D) INCORRECT. The lymphatic vessels are transport vessels without
smooth muscle.
Page Ref: 655
Objective: 25.2
⩥ Which of the following types of vessels have valves to maintain one-
way blood flow?
A) Arteries
,B) Capillaries
C) Veins
D) Arterioles. Answer: Answer: C
Explanation: A) INCORRECT. Arteries do not have valves to maintain
one-way blood flow.
B) INCORRECT. Capillaries do not have valves to maintain one-way
blood flow.
C) CORRECT. Veins have valves in them to maintain the one-way blood
flow back towards the heart.
D) INCORRECT. Arterioles do not have valves to maintain one-way
blood flow.
Page Ref: 655
Objective: 25.2
⩥ Which of the following BEST describes the function of blood?
A) It is a life-giving liquid that supports all the body's functions to
maintain hypoperfusion.
B) It clots, flows, transports, protects, and excretes on a daily basis.
C) It transports gases along with nutrients, aids in excretion, and
provides protection and regulation.
D) It flows from the heart with the vital gases and nutrients to maintain
lack of perfusion.. Answer: Answer: C
,Explanation: A) INCORRECT. Hypoperfusion is the lack of adequate
perfusion, or the lack of perfusion in a body, and the blood does not try
to maintain this.
B) INCORRECT. Blood is not intended to clot on a regular basis during
injury.
C) CORRECT. Blood transports gases like oxygen along with nutrients,
aids in excretion of waste products (like CO2), and provides protection
and regulation.
D) INCORRECT. Blood flows throughout the body and tries to maintain
perfusion, not lack of perfusion.
Page Ref: 656-657
Objective: 25.2
⩥ Which of the following is NOT part of the circulatory system?
A) Heart
B) Brain
C) Blood vessels
D) Blood. Answer: Answer: B
Explanation: A) INCORRECT. The heart is part of the circulatory
system.
B) CORRECT. The brain is part of the nervous system and not a part of
the circulatory system.
C) INCORRECT. The blood vessels are part of the circulatory system.
D) INCORRECT. Blood is part of the circulatory system.
, Page Ref: 654
Objective: 25.2
⩥ In which of the following vessels does the vital exchange take place
and also has the thinnest walls through which oxygen, nutrients, and
wastes can pass?
A) Capillaries
B) Microvenules
C) Arterioles
D) Veins. Answer: Answer: A
Explanation: A) CORRECT. The smallest vessels where gas exchange
can occur are in the capillaries.
B) INCORRECT. A microvenule would imply a smaller venule which
would still have too thick of a wall for gas exchange.
C) INCORRECT. The arterioles are smaller arteries, but their walls are
too thick and musculature, which prevents gas exchange from occurring.
D) INCORRECT. The veins are larger, but their walls are too thick and
musculature, which prevents gas exchange from occurring.
Page Ref: 655
Objective: 25.2
⩥ Which of the following BEST describes the delivery of oxygen and
nutrients at the body's cellular level?
A) Hydrostatic pressure
2026 QUESTIONS AND CORRECT ANSWERS
FULL SOLUTION GRADED A+
⩥ Which of the following vessels has the thickest muscular walls that
allow constriction and dilation?
A) Arteries
B) Capillaries
C) Veins
D) Lymphatic vessels. Answer: Answer: A
Explanation: A) CORRECT. Arteries have the thickest muscular walls to
allow for vasoconstriction and vasodilation.
B) INCORRECT. Capillaries are thin walled vessels without muscles.
C) INCORRECT. Veins have muscular walls, but are not as thick as
arteries.
D) INCORRECT. The lymphatic vessels are transport vessels without
smooth muscle.
Page Ref: 655
Objective: 25.2
⩥ Which of the following types of vessels have valves to maintain one-
way blood flow?
A) Arteries
,B) Capillaries
C) Veins
D) Arterioles. Answer: Answer: C
Explanation: A) INCORRECT. Arteries do not have valves to maintain
one-way blood flow.
B) INCORRECT. Capillaries do not have valves to maintain one-way
blood flow.
C) CORRECT. Veins have valves in them to maintain the one-way blood
flow back towards the heart.
D) INCORRECT. Arterioles do not have valves to maintain one-way
blood flow.
Page Ref: 655
Objective: 25.2
⩥ Which of the following BEST describes the function of blood?
A) It is a life-giving liquid that supports all the body's functions to
maintain hypoperfusion.
B) It clots, flows, transports, protects, and excretes on a daily basis.
C) It transports gases along with nutrients, aids in excretion, and
provides protection and regulation.
D) It flows from the heart with the vital gases and nutrients to maintain
lack of perfusion.. Answer: Answer: C
,Explanation: A) INCORRECT. Hypoperfusion is the lack of adequate
perfusion, or the lack of perfusion in a body, and the blood does not try
to maintain this.
B) INCORRECT. Blood is not intended to clot on a regular basis during
injury.
C) CORRECT. Blood transports gases like oxygen along with nutrients,
aids in excretion of waste products (like CO2), and provides protection
and regulation.
D) INCORRECT. Blood flows throughout the body and tries to maintain
perfusion, not lack of perfusion.
Page Ref: 656-657
Objective: 25.2
⩥ Which of the following is NOT part of the circulatory system?
A) Heart
B) Brain
C) Blood vessels
D) Blood. Answer: Answer: B
Explanation: A) INCORRECT. The heart is part of the circulatory
system.
B) CORRECT. The brain is part of the nervous system and not a part of
the circulatory system.
C) INCORRECT. The blood vessels are part of the circulatory system.
D) INCORRECT. Blood is part of the circulatory system.
, Page Ref: 654
Objective: 25.2
⩥ In which of the following vessels does the vital exchange take place
and also has the thinnest walls through which oxygen, nutrients, and
wastes can pass?
A) Capillaries
B) Microvenules
C) Arterioles
D) Veins. Answer: Answer: A
Explanation: A) CORRECT. The smallest vessels where gas exchange
can occur are in the capillaries.
B) INCORRECT. A microvenule would imply a smaller venule which
would still have too thick of a wall for gas exchange.
C) INCORRECT. The arterioles are smaller arteries, but their walls are
too thick and musculature, which prevents gas exchange from occurring.
D) INCORRECT. The veins are larger, but their walls are too thick and
musculature, which prevents gas exchange from occurring.
Page Ref: 655
Objective: 25.2
⩥ Which of the following BEST describes the delivery of oxygen and
nutrients at the body's cellular level?
A) Hydrostatic pressure
