Cardiac muscle cells have a long _____ period so that rapid stimulation produces isolated rather than spasmic contractions.

Which valve guards the base of the aorta and opens when the ventricles are contracting:

Resistance is a force that

Which of the following hormones promotes sodium ion reabsorption by the kidney in order to increase blood pressure and blood volume:

Which of the following is true about the atrial reflex?

A slower-than-normal heart rate is called

________ is the symptom generally brought on by coronary ischemia.

Figure 20-2 Cardiac Cycle Use Figure 20-2 to answer the following questions: What occurs at “A” on the graph?

Turbulent blood flow occurs

Listing. List three differences between arteries, veins and capillaries (ex.- characteristics, function, what they carry, etc) (2 X’s each) Arteries Veins Capillaries