1.

Oxygen moves easily out of blood capillaries into cells because ___________. (1 point)

the walls are very thin
because it is very small
because other gases push it out
cells need the oxygen

2.
Which of the following statements is false? (1 point)

Arteries carry blood away from the heart.
Veins carry blood back to the heart.
Capillaries and arteries are similar in size.
Blood travels from arteries to capillaries.

3.
The blood is transported to the left side of the heart from the ________ through the ___________ . (1 point)

lungs; aorta
body; pulmonary artery
body; vena cava
lungs; pulmonary vein

4.
______________ takes blood from the heart to the lungs and back again, while ____________ takes blood to and from tissues of the heart. (1 point)

Systemic circulation; coronary circulation
Pulmonary circulation; coronary circulation
Coronary circulation; systemic circulation
Systemic circulation; pulmonary circulation

5.
Blood is transported to the lungs through the __________ to collect __________ and remove _____________ . (1 point)

vena cava; carbon dioxide; oxygen
pulmonary artery; oxygen; carbon dioxide
pulmonary vein; nitrogen; oxygen
aorta; gas; water

We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though. Indicate your answers.

1. The correct answer is "the walls are very thin." Oxygen moves easily out of blood capillaries into cells because the walls of capillaries are very thin, allowing for efficient diffusion of oxygen into the surrounding tissues.

2. The false statement is "Capillaries and arteries are similar in size." Capillaries are much smaller in size compared to arteries. Arteries carry oxygen-rich blood away from the heart, while capillaries allow for exchange of gases and nutrients between the blood and surrounding tissues. Veins, on the other hand, carry oxygen-depleted blood back to the heart.

3. The blood is transported to the left side of the heart from the lungs through the pulmonary veins. Oxygenated blood from the lungs enters the left atrium of the heart through the pulmonary veins, which then contracts to pump the blood into the left ventricle before it is pumped out to the rest of the body through the aorta.

4. Pulmonary circulation takes blood from the heart to the lungs and back again, while systemic circulation takes blood to and from tissues of the body. Pulmonary circulation ensures that blood is oxygenated in the lungs, while systemic circulation delivers oxygenated blood to various tissues and organs in the body and returns deoxygenated blood back to the heart.

5. Blood is transported to the lungs through the pulmonary artery to collect oxygen and remove carbon dioxide. Deoxygenated blood from the right ventricle of the heart is pumped through the pulmonary artery to the lungs, where carbon dioxide is released from the blood and oxygen is taken up, resulting in oxygenated blood returning to the heart through the pulmonary veins.