Vertebrates have been thought of as "dual animals," consisting of both segmented and unsegmented portions. How is this duality reflected in their embryonic development and the structure of the nervous system?
What will be an ideal response?
During embryonic development the mesoderm is divided into the segmented somite (making, among other things, the striated muscles that power locomotion) and the unsegmented lateral plate (making, among other things, the smooth muscles of the gut). The dual nervous system follows this embryological division: the somatic (voluntary nervous system) innervates the striated muscles, and the visceral (involuntary nervous system) innervates the smooth muscles.
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Discuss the role of effector in both the negative and positive feedback loops
What will be an ideal response?
The inferior nasal conchae
A) attach muscles that move the eye. B) contain the nerves for olfaction. C) create turbulence in the nasal passageways. D) protect the pituitary gland. E) attach muscles that move the eyelids.
Pupillary muscle groups are controlled by the ANS. Parasympathetic activation causes pupillary ________, and sympathetic activation causes ________
A) dilation; constriction B) dilation; dilation C) constriction; dilation D) constriction; constriction E) vasoconstriction; vasoconstriction
The expanded distal end of the fibula is called the
A. head. B. shaft. C. medial malleolus. D. lateral malleolus. E. neck.