The ________ is the part of the sperm that contains the DNA
A) head
B) neck
C) acrosome
D) zona pellucida
E) corona radiata
A
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All structural types of neurons contain only one axon.
Answer the following statement true (T) or false (F)
Mr. Smith hypoventilates and retains too much carbon dioxide. Which of the following receptors is stimulated by an increase in carbon dioxide?
A. irritant receptors B. pressure receptors C. osmoreceptors D. peripheral chemoreceptors E. baroreceptors
Blood pressure is lowest in the
A. aorta. B. superior and inferior vena cavae. C. venules. D. capillaries.
Matching
A) Sodium ions B) Acetylcholinesterase C) Calcium ions D) Acetylcholine E) Creatine phosphate 27) The final chemical messenger and "trigger" for muscle contraction. It binds to troponin. 28) A neurotransmitter released at motor end plates by the axon terminals. 29) It diffuses across the cell membrane resulting in depolarization. 30) Activates synaptic vesicles in axon terminals to fuse with plasma membrane of axon terminal. 31) Used to convert ADP to ATP by transfer of a high-energy phosphate group. A reserve high-energy compound. 32) Breaks down ACh into its building blocks, rendering it ineffective.