Which muscle of the hamstring group functions to extend the thigh?
A) biceps femoris
B) semitendinosus
C) semimembranosus
D) vastus lateralis
C
Explanation:
A) The biceps femoris flexes the leg and also abducts the thigh.
B) The semitendinosus functions to flex the leg.
D) While the vastus lateralis functions to extend the leg, it is a muscle of the quadriceps femoris group, not the hamstrings.
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Which of the following describes a comminuted fracture?
A. The bone is broken into three or more pieces. B. The bone is bent on one side and has an incomplete fracture on the other side. C. The fracture is parallel to the long axis of the bone. D. A fine crack is visible but bones are still aligned. E. The fracture spirals around the axis of a long bone.
Myelin
A. is released from a neuron and travels to another neuron. B. is produced in response to bacterial infection. C. is a form of chromatophilic substance that fills Schwann cells. D. consists of layers of lipids and proteins that wrap around an axon.
Sperm cannot fertilize an egg unless they have been in the female reproductive tract for several hours. This enhanced ability of the sperm to fertilize the ovum is called capacitation. In vitro studies indicate that the sperm can fertilize the ovum if they are first washed before being introduced to the ovum. These observations suggest that
A) pH is an important factor in the process of capacitation. B) in capacitation, secretions of the female reproductive tract are taken up by the sperm. C) only sperm that come into contact with vaginal secretions are capable of fertilizing an ovum. D) capacitation is temperature-dependent. E) capacitation involves the removal of some inhibiting substance(s) from the sperm.
Saliva
A. is produced only when there is food in the mouth. B. is responsible for peristalsis in the mouth. C. increases ulceration in the mouth. D. moistens food and begins starch digestion in the mouth. E. does not prevent bacterial infection in the mouth.