Which of the following is unique to RNA?
A) glucose
B) phosphate group
C) ribose
D) adenosine triphosphate
E) deoxyribose
C) ribose
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Within lymph nodes, fixed macrophages and dendritic cells remove at least ________ percent of antigens arriving in lymph.
A) 10 B) 25 C) 50 D) 80 E) 99
Muscle tension does not change in isometric contractions
Indicate whether the statement is true or false
During exercise, hemoglobin releases more oxygen to active skeletal muscles than it does when those muscles are at rest. Why?
A) Decreased temperature and increased pH generated by active skeletal muscles cause hemoglobin to release more oxygen during exercise than when the muscles are at rest. B) Decreased temperature and decreased pH generated by active skeletal muscles cause hemoglobin to release more oxygen during exercise than when the muscles are at rest. C) Increased temperature and decreased pH generated by active skeletal muscles cause hemoglobin to release more oxygen during exercise than when the muscles are at rest. D) Increased temperature and increased pH generated by active skeletal muscles cause hemoglobin to release more oxygen during exercise than when the muscles are at rest. E) Decreased temperature and increased oxygen generated by active skeletal muscles cause hemoglobin to release more oxygen during exercise than when the muscles are at rest.
T tubules are invaginations of the
A. sarcoplasm. B. sarcomere. C. myofibril. D. sarcoplasmic reticulum. E. sarcolemma.