In response to action potentials arriving from the transverse tubules, the sarcoplasmic reticulum releases
A) Acetylcholine.
B) Sodium ions.
C) Potassium ions.
D) Calcium ions
E) Hydrogen ions.
D) Calcium ions
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Exposure to ultraviolet light (sunlight) causes the skin to darken by increasing the production of
A) hemoglobin. B) carotene. C) collagen. D) keratin. E) melanin.
Which of the following will cause a decrease in blood pressure?
A) increased levels of aldosterone B) increased levels of angiotensin II C) increased blood volume D) increased levels of ANP (atrial natriuretic peptide) E) increased levels of ADH (antidiuretic hormone)
Blood is commonly drawn from the vein in this region of the forelimb
A) cubital fossa B) bicipital furrow C) axilla D) anatomical snuff box
Compare the submucosal neural plexus with the myenteric plexus
A) The submucosal neural plexus and the myenteric plexus both contain neurons but the submucosal neural plexus innervates the mucosa only, whereas the myenteric plexus innervates the serosa only. B) The submucosal neural plexus contains only sensory neurons, whereas the myenteric plexus contains only motor neurons. C) The submucosal neural plexus and the myenteric plexus are both intricate capillary beds found in the layers of the digestive tract. D) The submucosal neural plexus and the myenteric plexus both contain neurons but the submucosal neural plexus innervates the mucosa and submucosa, whereas the myenteric plexus innervates the muscular layer. E) The submucosal neural plexus contains only motor neurons, whereas the myenteric plexus contains only sensory neurons.