Which of the following contains chemicals that kill bacteria and prevent bacterial invasions of the skin?
A) sweat
B) hemoglobin
C) keratin
D) sebum
E) melanin
D
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Which type of innervation causes the heart rate to increase?
A. Parasympathetic B. Sympathetic
Which organ or tissue contains equal numbers of B and T cells?
A) blood B) thymus C) bone marrow D) liver E) spleen
Which of the following is a freely movable joint?
A) diarthrosis B) synarthrosis C) amphiarthrosis D) fibrous
Describe the functions of the facial bones
A) The facial bones protect the anterior portion of the brain. B) The facial bones protect the posterior portion of the brain and provide a site of attachment for neck muscles. C) The facial bones protect and support the entrances to the digestive and respiratory tracts and provide a site of attachment for muscles of facial expression. D) The facial bones provide a site of attachment for the muscles that move the eyes, jaw, and head. E) The facial bones form the lower jaw and provide a site of attachment for muscles that allow speaking and chewing.