The unit of skeletal muscle structure that is composed of bundles of myofibrils, enclosed within a sarcolemma, and surrounded by a connective tissue covering called endomysium is a
a. myofibril.
b. fascicle.
c. myofilament.
c. myofilament.
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When cats fight, their fur rises due to which mechanism?
A. Myoepithelial cell syneresis B. Piloerector muscle contraction C. Secretion of sebum into hair follicles D. Increased blood flow to the skin E. Stimulation of apocrine glands
Which of the following is true about the movement of ions across excitable living membranes?
A) Ions always move actively across membranes through leakage channels. B) Some ions are prevented from moving down their concentration gradients by ATP-driven pumps. C) Sodium gates in the membrane can open in response to electrical potential changes. D) The bulk of the solutions inside a cell are negatively charged.
The hormone responsible for milk production is
A. estrogen. B. progesterone. C. oxytocin. D. prolactin. E. FSH.
The secretion of ________ sweat glands is viscous, cloudy, and rich in proteins and lipids.
Fill in the blank(s) with the appropriate word(s).