When one motor neuron fires a single action potential the result affects one
A) synaptic cleft.
B) motor unit.
C) upper motor neuron.
D) lower motor neuron.
E) sensory unit.
B) motor unit.
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Answer the following statements true (T) or false (F)
1. The spine has three curves; two convex and one concave. 2. Because the last two sets of ribs are not attached to any other bones in the body, they are called floating ribs. 3. Only the true ribs attach to the sternum by the costal cartilage. 4. The olecranon process of the humerus and the olecranon fossa of the ulna make up the structure of the elbow. 5. The indentation in the femur where the patella or kneecap fits is called the acetabulum.
The growth rate for a scalp hair is about ________ per day for 18 months to 7 years, and then the hair becomes dormant.
A. 1/2 mm B. 1.0 mm C. 0.75 mm D. 1.0 cm E. 1/3 mm
Which of the following cells undergoes meiosis to produce four sperm?
A) spermatids B) spermatogonium C) primary spermatocyte D) ovum E) zygote
Aldosterone will cause ________ of sodium, while ANH will cause ________ of sodium.
A. reabsorption; excretion B. excretion; reabsorption