Blood enters the _______________ (letter F) from the left ventricle to be distributed throughout the body. 

Nicotinic receptors are found on all of the following, EXCEPT:

A) cholinergic and adrenergic preganglionic neurons. B) cholinergic and adrenergic postganglionic neurons. C) spinal cord neurons. D) skeletal muscle.

Which of the following is TRUE regarding back fitness?

A) One of the best exercises for the back is the old-fashioned sit-up. B) While important for appearance, posture has little to do with the risk of back injury. C) Abdominal muscles are crucial to overall spinal-column strength and safe lifting. D) Exercise has been shown to contribute to intervertebral disc deterioration.