The space between two neurons is called the ________.

A drug that blocks the action of the hormone cholecystokinin would affect all of the following except

A) relaxation of the hepatopancreatic sphincter. B) the composition of pancreatic secretions. C) the delivery of bile. D) digestion of lipids and proteins. E) absorption of water in the large intestines.

The first heart sound, "lub," is made by

A. closure of the semilunar valves. B. contraction of the ventricles. C. closure of the AV valves. D. contraction of the atria.

The AV valve that is located on the same side of the heart as the origin of the aorta is the

A. bicuspid or mitral valve. B. tricuspid valve. C. aortic semilunar valve. D. pulmonary semilunar valve. E. coronary sinus valve.

Which of the following was an adaptation that evolved in connection with human upright walking?

A) Color vision B) Hair C) Stereoscopic vision D) Spinal and pelvic anatomy E) Fully opposable thumbs