The Circulatory and Respiratory Systems Answers

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Kristen is running a half marathon. By her tenth minute of running, her breathing rate has increased from her resting rate.Which statement best describes how her tissues are responding to her running?

A
They need more oxygen to function, so gas exchange needs to decrease.
B
They need more oxygen to function, so gas exchange needs to increase.
C
They need more carbon dioxide to function, so gas exchange needs to increase.
D
They need more carbon dioxide to function, so gas exchange needs to decrease.
3

Gerald is lightheaded and tired from a lack of oxygen in his tissues.What is most likely the reason he feels this way?

A
His plasma level is high.
B
His white blood cell count is high.
C
His platelet count is low.
D
His red blood cell count is low.
4

The is the fluid component of blood.

Answer not available
5

Which best describes carbon dioxide’s path out of the body?

A
nose → pharynx → larynx → trachea → bronchus → alveoli
B
alveoli → trachea → bronchus → larynx → pharynx → nose
C
alveoli → bronchus → trachea → larynx → pharynx → nose
D
nose → larynx → pharynx → trachea → bronchus → alveoli
6

Which statements describe the movement of blood through the heart? Select two options. Blood from the veins enters the ventricles.Atria and ventricles contract at the same time.Atria push blood into the ventricles.Valves allow for two-way blood flow.Ventricles push blood out of the heart.

A
Blood from the veins enters the ventricles.
B
Atria and ventricles contract at the same time.
C
Atria push blood into the ventricles.
D
Valves allow for two-way blood flow.
E
Ventricles push blood out of the heart.
8

Which is located inside the lung?

A
the larynx
B
the pharynx
C
the trachea
D
the alveoli
9

At the site of gas exchange in the lungs, where does the oxygen move?

A
O2 moves from the alveoli to the white blood cells.
B
O2 moves from the white blood cells to the alveoli.
C
O2 moves from the alveoli to the red blood cells.
D
O2 moves from the red blood cells to the alveoli.
10

Which statement explains blood pressure?

A
Blood pressure is highest in the veins near the heart.
B
Blood pressure is highest in the arteries near the heart.
C
Blood pressure is highest in the veins farthest away from the heart.
D
Blood pressure is highest in the arteries farthest away from the heart.

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