3. Which of the following statements are accurate? A. Veins in the pulmonary circuit carry oxygen-rich...

3. Which of the following statements are accurate?

A. Veins in the pulmonary circuit carry oxygen-rich blood

B. Arteries in the pulmonary circuit deliver oxygen-rich blood to the body tissues.

C. All arteries carry blood away from the heart

D. Arteries in the pulmonary circuit deliver oxygen-poor blood to the lungs.

E. Veins in the systemic circuit return oxygen-poor blood to the heart.

4. Which of the following statements are accurate?

A. The heartbeat in a human heart is initiated by the atrioventricular mode.

B. During systole, the heart's ventricle(s) is/are relaxing and filling with blood.

C. During systole, blood will be pumped from the heart into the veins of the body

D. The pulse is used to determine one's heart rate.

E. The nervous system and certain hormones can alter pacemaker activity.

5. Which of the following statements are accurate?

A. Red blood cells are known as erythrocytes.

B. Hemoglobin would be found in white blood cells and functions in carrying oxygen in body tissues.

C. The liquid portion of the blood is known as the hematocrit.

D. Platelets are the only thing in the blood that contributes to blood clotting.

E. Lymphocytes are the only type of white blood cells and are immune cells

Solutions

Expert Solution

3. Options A and D are correct. Veins in the pulmonary circuit carry oxygen-rich blood. The pulmonary veins bring oxygen-rich blood to the left atrium. Arteries in the pulmonary circuit deliver oxygen-poor blood to the lungs. The pulmonary artery channels oxygen-poor blood from the right ventricle into the lungs, where oxygen enters the bloodstream.

4. Both option D and E is right. The pulse is used to calculate the heartbeat. The calculated pulse is multiplied by 4 to calculate heartbeat. Both CNS and hormones alter pacemaker activity. To increase heart rate, the autonomic nervous system increases sympathetic outflow to the SA node, with concurrent inhibition of vagal tone. Norepinephrine released by sympathetic activation of the SA node binds to beta-adrenoceptors. This increases the rate of pacemaker.

5. Both option A and D is right. RBCs are called erythrocytes. Platelets are the only thing in the blood that contributed to blood clotting.

gladiator answered 2 weeks ago

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