In the embryo, parallel ridges named digital rays are visible. Which structures will they become?
A. Ribs and vertebrae
B. Leg and forearm
C. The ulna and radius
D. Fingers and toes
E. Tarsals and metatarsals
Answer: D
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Which of the following statements concerning hair is false?
A) The medulla is the soft core of the hair. B) The cortex of the hair is composed of hard keratin. C) Terminal hairs are heavy and more darkly pigmented than other types of hair. D) Club hair is hair that has ceased growing. E) Scalp hairs grow constantly throughout life.
The endothelium of the glomerulus is made up of ________ capillaries.
A. continuous B. fenestrated
The activation of additional motor units in a skeletal muscle, in order to increase muscle tension, is called motor unit recruitment.
Answer the following statement true (T) or false (F)
The round ligament of the liver is the fibrous remanat of which of the following structures?
(a) umbilical vein (b) ductus venosus (c) ductus arteriosus (d) umbilical artery (e) urachus