Which type of cell would have an abundance of peroxisomes?
A. White blood cell, a phagocyte
B. Liver cells that detoxify hydrogen peroxide
C. Cardiac muscle cells (require large amounts of ATP)
D. Fibroblast (makes protein fibers)
E. Mucus cell (secretes mucus)
Answer: B
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Which of the following statements is FALSE?
A. Ca2+ that activates contraction of smooth muscles can come from either the ECF or from the sarcoplasmic reticulum. B. In the absence of any neural input, skeletal muscle cannot generate tension. C. A single smooth muscle cell may be innervated by both a sympathetic neuron and a parasympathetic neuron. D. Synaptic input onto skeletal muscle cells is always excitatory, whereas inputs to smooth muscle cells may be either excitatory or inhibitory. E. Contractile activity of smooth muscle cells does not normally require Ca2+.
Undescended testes cause infertility because
A) they undergo apoptosis, and can no longer produce sperm. B) there is too little testosterone. C) they become entangled in the seminiferous tubules, which then degenerate. D) sperm development is impeded by the higher internal body temperature.
A sensory cutaneous region, innervated by a single pair of spinal nerves, is called a ________
A) receptive field B) dermatome C) sensory neuron D) plexus