Which of the following best describes the term Z line?
A) protein that accounts for elasticity of resting muscle
B) repeating unit of striated myofibrils
C) storage site for calcium ions
D) thin filaments are anchored here
E) largely made of myosin molecules
D
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The hand has ________ bones in the wrist and ________ bones in the palm
A) 5; 5 B) 10; 5 C) 8; 4 D) 8; 5 E) 4; 5
Trace elements such as zinc and manganese are found in minute quantities in the body but do not serve any known function.
Answer the following statement true (T) or false (F)
A cell finishing mitosis has ________ DNA molecules, while a cell finishing DNA replication has ________ DNA molecules.
A. 23; 23 B. 23; 46 C. 46; 92 D. 46; 23 E. 46; 46
Which of the following choices lists a correct sequence of events following the depolarization of transverse tubules in excitation-contraction coupling in cardiac muscle?
A. calcium release into cytosol, calcium ion influx through sarcolemma, actin and myosin attach, thin filaments slide toward the middle of sarcomeres B. actin and myosin attach, thin filaments slide toward the middle of sarcomeres, calcium release into cytosol C. calcium release into cytosol, actin and myosin attach, calcium ion influx through sarcolemma, thin myofilaments slide toward the middle of sarcomeres D. calcium release into cytosol, actin and myosin attach, thin filaments slide toward the middle of sarcomeres, calcium ion influx through sarcolemma E. calcium ion influx through sarcolemma, calcium release into cytosol, actin and myosin attach, thin myofilaments slide toward the middle of sarcomeres