4. From the list of functions below, select the function of the valves of the heart.
a. Prevents air from entering the blood.
b. Allows blood to pass from a chamber but prevents it from returning to that
c. Prevents blood from passing through the heart.
d. Prevents blood from flowing in the veins.
Select the statement that best describes the atrioventricular (AV) node.
a. Acts as a relay station for the impulses originated by the sinoatrial (SA) node.
b. Acts as the pacemaker of the heart.
c. Acts as an attachment that prevents the heart from shifting in the body during
periods of exercise.
d. Controls the backflow of blood into the different chambers of the heart.
6. From the list below, select the function of the lymphatic system.
a. Excretes cholesterol from the body.
b. Assists in the deamination (breakdown) of amino acids.
c. Forms lymphocytes.
d. Transmits nerve impulses.
7. From the components below, select the component of bile.
a. Bile salts.
b. Bile sugars.