The male gonad is called a ________.
Fill in the blank(s) with the appropriate word(s).
testis (testicle)
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The enzyme catalase neutralizes hydrogen peroxide produced in hair follicles.
Answer the following statement true (T) or false (F)
Answer the following statements true (T) or false (F)
1. One of the differences between how the endocrine system and nervous system control body functions is the more rapid communication of the nervous system. 2. There are two types of cells in the nervous system, neurons and glia cells. 3. An axon transmits impulses toward the cell body. 4. Neurons can be classified based on the direction in which they transmit impulses. 5. Motor neurons conduct impulses toward the central nervous system.
Compared to the primary bronchi, the secondary and tertiary bronchi have
A) more cartilage. B) less smooth muscle. C) more smooth muscle. D) less cartilage. E) both less cartilage and more smooth muscle.
An opsonin is a __________________
A. subclass of immunoglobulin. B. compound released by leukocytes that aids in the immune response to an antigen. C. substance that promotes fever. D. compound released by leukocytes that inhibits the immune response to an antigen. E. substance that makes antigens more susceptible to phagocytosis.