Which of the following is a proton donor?
A. a salt
B. a base
C. a neutral substance
D. an acid
E. glucose
D
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The rotator cuff of the shoulder is composed mainly of
A. muscle tendons. B. epithelium and loose connective tissue. C. adipose and epithelial tissue. D. articular cartilage.
Lymphatic organs differ from lymphatic tissues in what way?
A) They contain T lymphocytes and lymphatic tissues do not. B) They are found in the digestive tract and lymphatic tissues are found in the thorax. C) They are surrounded by a fibrous capsule and lymphatic tissues are not. D) They cannot produce antibodies, whereas lymphatic tissues can. E) They occur throughout the body except in the head.
Heparin prevents blood clotting by
A) interfering with the formation of thrombin and fibrinogen. B) depleting the blood of platelets. C) inhibiting the formation of prothrombin activator and the action of thrombin on fibrinogen. D) binding to calcium ions.
Nerves that innervate the muscles and skin of the leg arise from the ________.
A. brachial plexus B. sacral plexus C. lumbar plexus D. Both the sacral and lumbar plexuses are correct.