Chapter 4, Problem 9RQ

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

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.

An electrical difference across the fibers of the heart is called the A. Absolute refractory period B. Resting membrane potential C. Action potential D. Depolarization