Outline the general pathway for the formation, circulation, and reabsorption of cerebrospinal fluid (CSF)
What will be an ideal response?
CSF is formed when fluid and electrolytes leak out of the capillaries of choroid plexuses in the ventricles. Ependymal cells secrete CSF into the ventricles by exocytosis. CSF circulates through and around the brain and spinal cord in the subarachnoid space. Some of the CSF is reabsorbed into the blood in the dural sinuses via the arachnoid granulations.
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In response to action potentials arriving along the transverse tubules, the sarcoplasmic reticulum releases
A) acetylcholine. B) sodium ions. C) potassium ions. D) calcium ions. E) hydrogen ions.
If precapillary sphincters relax, local blood flow in the capillary bed ________; if this occurs in several capillary beds at the same time, and no other circulatory changes occur, then systemic blood pressure ________.
A. increases; decreases B. increases; increases C. decreases; decreases D. decreases; increases
The respiratory membrane is composed of:
A. the alveolar sacs and pulmonary arteries. B. the alveolar membrane, the capillary wall, and their fused basement membrane. C. the fusion of the type I cells and type II cells in the lungs. D. the cells found between the alveolar pores.
What do the basal nuclei coordinate?
a. slow twitch muscle fibers b. spinal reflexes c. slow, sustained movement d. fast movement e. fast twitch muscle fibers