As the respiratory system ages:
a. the costal cartilages harden
b. a condition called “barrel chest” develops
c. the strength of inspiratory and expiratory muscles decreases
d. all of the above
d. all of the above
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Which part of the neuron carries the nerve impulse?
A. Axon B. Dendrites C. Body D. Synaptic knob
What are the two major functional properties of neurons?
A) cover and line body surfaces B) contraction and movements C) irritability and conductivity D) connect and protect E) lubricate and secrete
Stimulation of ?1 receptors present on smooth muscle cells of blood vessels to the skin by norepinephrine results in:
A) vasodilation. B) bronchodilation. C) vasoconstriction. D) sweating.
Which type of skin cancer is the most deadly?
A. Kaposi's sarcoma B. basal cell carcinoma C. melanoma D. squamous cell carcinoma E. psoriasis