Describe the role of preganglionic neurons
A) They are part of visceral reflex arcs, and most of their activity is a direct reflex response, rather than responses to commands from the hypothalamus.
B) They are part of the visceral motor neurons in peripheral ganglia.
C) They are ganglionic neurons that innervate visceral effectors.
D) They are upper motor neurons whose cell bodies lie within nuclei of the brain or the primary motor cortex.
E) They are motor neurons within the central nervous system that are controlled by reflexes based in the spinal cord or brain.
Answer: A
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Which of the following describes the suprahyoid muscles?
A) They depress the larynx and hyoid bone if the mandible is fixed. B) They are a group of muscles that lie superior to the hyoid bone and help form the floor of the oral cavity. C) They move the pharynx superiorly during swallowing. D) They are often called strap muscles.
The total amount of neurotransmitter released at the axon terminal is directly related to
A) the amplitude of the action potential. B) the total number of action potentials. C) the length of the axon. D) the amplitude of the graded potential.
Human chorionic gonadotropin
a. is secreted from the corpus luteum b. in the urine is the basis of pregnancy diagnosis tests c. stimulates placental secretion of estrogen and progesterone d. is secreted from the myometrium e. is secreted from the sperm cell involved in fertilization
The yellow marrow that fills the medullary cavities of many bones is dominated by ________.
A) adipocytes B) immature red blood cells C) stem cells D) mature red blood cells E) osteocytes