Question

science homework #14
poa checklist:
key words are circled in the
question and answer choices

1. arrange the steps in the correct order to show how oxygen-

poor blood travels through the heart to the lungs and returns
as oxygen - rich blood.
a. oxygen - rich blood flows from the lungs into the left atrium of the heart through the pulmonary veins
b. oxygen - poor blood flows from the right ventricle to the lungs through the pulmonary arteries.
c. the left ventricle pumps oxygen - rich blood into the aorta, sending it throughout the body.
d. oxygen - poor blood returns from the body to the right atrium through the superior and inferior vena cava.

1. why is it essential to have two different sides of the heart? explain your answer.
2. which of the following best explains the main role of the circulatory system?

a. breaking down and absorbing food
b. moving oxygen from the air into the body
c. carrying oxygen and nutrients to all parts of the body
d. releasing hormones that control growth, metabolism, and reproduction

1. which statement best describes the path of blood through the circulatory system?

a. blood enters the right side of the heart, travels to the lungs, and leaves from the left side to circulate through the
body.
b. blood enters the right side of the heart, travels to the lungs, and leaves again from the right side to circulate
through the body.
c. blood enters the left side of the heart, travels to the lungs, and leaves from the left side to circulate through the
body.
d. blood enters the left side of the heart, travels to the lungs, and leaves from the right side to circulate through th
body.

1. explain the primary difference between the function of an artery and a vein in the circulatory system.
2. how is the pulmonary vein different from other veins? explain.

Explanation:

Question 1

The correct order of blood flow is based on the pulmonary circulation pathway. Oxygen - poor blood first returns to the right atrium (D). Then it is pumped to the lungs from the right ventricle (B). After oxygenation in the lungs, it flows to the left atrium (A). Finally, the left ventricle pumps it out to the body (C).

The heart has two sides (right and left) to separate oxygen - poor and oxygen - rich blood. The right side deals with oxygen - poor blood (sending it to the lungs for oxygenation), and the left side deals with oxygen - rich blood (sending it to the body). This separation ensures efficient oxygen delivery.

• Option A: Breaking down and absorbing food is the role of the digestive system.
• Option B: Moving oxygen from the air into the body is mainly the role of the respiratory system (though the circulatory system helps in transport).
• Option C: The circulatory system (with the heart as the pump) carries oxygen (from the lungs) and nutrients (from the digestive system) to all body cells.
• Option D: Releasing hormones is the role of the endocrine system.

Answer:

D → B → A → C

Question 2