Chapter 22, Problem 20MC

A characteristic of blood circulation through or to the heart is that: a. the superior vena cava conveys blood to the head. b. the inferior vena cava conveys blood to the right atrium. c. the pulmonary arteries convey blood from the lungs to theleft atrium. d. the pulmonary veins convey blood into the left ventricle. e. the aorta branches into two coronary arteries that conveyblood from heart muscle.

When the systemic blood pressure increases, the aortic and carotid sinus baroreceptors initiate reflexes that cause a/an 1. Increased heart rate 2. Decreased ventilatory rate 3. Increased ventilatory rate 4. Decreased heart rate A. 1 only B. 2 only C. 3 only D. 2 and 4 only

In the fetal circulation, once blood enters the right atrium, most of the blood enters the left atrium by passing through the A. Ductus arteriosus B. Ductus venosus C. Pulmonary arteries D. Foramen ovale

An atrial septal defect is a birth defect in which there is an opening in the septum between the left and right atria. People with such a defect typically have more than a normal amount of blood in the right atrium. Why does blood flow from left to right across the septum rather than in the opposite direction? The excess of blood can cause hypertension in one circuit. Which one?