Contraction of the diaphragm ____
a. diminishes the volume of the thoracic cavity
b. increases the volume of the thoracic cavity
c. pushes the rib cage downward
d. causes external intercostal muscles to relax
e. decreases lung capacity
ANSWER: b
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What event results from the hydrolysis of ATP to ADP by the myosin head?
A. cross-bridge formation B. shortening of the muscle fiber C. cocking of myosin head to its high-energy position D. the power stroke
Starchy foods in our diets, such as rice and potatoes, consist of many glucose molecules covalently bonded together to form
A. a simple sugar. B. a complex carbohydrate. C. a fatty acid chain. D. a triglyceride. E. a protein.
Which of the following white blood cells have
receptors for activated complement proteins?
a. dendritic cells, macrophages, and neutrophils b. mast cells, macrophages, and neutrophils c. dendritic cells, B lymphocytes, and neutrophils d. dendritic cells, eosinophils, and macrophages e. all of these white blood cells have receptors for activated complement proteins
When you step on a cockroach or smash a fly, the blood appears colorless because
A. there are no cells in the hemolymph. B. the blood is enclosed in a closed circulatory system. C. it does not contain hemoglobin or any other respiratory pigment. D. the blood is actually a colorless hemolymph that carries oxygen on molecules other than reddish hemoglobin.