Which of the following helps explain the increased tension seen in multiple wave summation?
A. increased motor unit recruitment
B. increased concentration of calcium ions around the myofibrils
C. exposure of more active sites on myosin myofilaments
D. the breakdown of elastic elements in the cell
E. decreased stimulus frequency
B
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Which of the following best describes a motor unit?
A) a section of a myofibril from Z disk to Z disk B) one motor neuron and all the muscle fibers innervated by that neuron C) all of the neurons that unite to make a whole muscle contract D) all of the fascicles innervated by several neurons
How do nutrients reach the epidermis of the skin?
A) Blood vessels carry nutrients directly into the epidermis. B) Nutrients migrate in vesicles from the hypodermis into the epidermis. C) Solute pumping transports nutrients into the epidermis. D) Diffusion transports nutrients from blood vessels in the dermis into the epidermis.
________ burns involve the epidermis, all of the dermis, and often some deeper tissue
A) Third-degree B) Partial-thickness C) Second-degree D) First-degree E) Malignant
Which type of gamete remains viable for a longer time after it enters the female reproductive tract?
A. Egg B. Sperm