Which of the following statements is NOT correct regarding the motor units and their activation?
A) A motor unit in muscles of gross movement can have thousands of muscle cells.
B) The metabolic capacity of muscle fibers within a motor unit can be altered.
C) At its peak intensity, a contractile stimulus will activate muscle fibers that are easily fatigued.
D) A weak contractile stimulus activates fast-twitch motor units.
E) All muscle fibers in a single motor unit are of the same fiber type.
D) A weak contractile stimulus activates fast-twitch motor units.
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The event called "crossing over" in meiosis results in
A. irreversible mutations. B. a change in the gender (sex) of the embryo. C. greater vitality of sex cells making them more active. D. less genetic variety in sex cells. E. greater genetic variety in sex cells and thus in embryos.
For facilitated diffusion to occur it requires ________.
A. a gradient B. a carrier protein C. energy D. a gradient and carrier protein
Although the integument is a covering, it is by no means simple, and some of its functions include ________.
A) the dermis providing the major mechanical barrier to chemicals, water, and other external substances B) resident macrophage-like cells whose function is to ingest antigenic invaders and present them to the immune system C) cooling the body by increasing the action of sebaceous glands during high-temperature conditions D) epidermal blood vessels serving as a blood reservoir
Mesothelium, also called ____ tissue, consists of simple squamous epithelium
a. connective b. serous c. endothelium d. adipose