The extensions of the sarcolemma that carry the nerve impulses deep into the sarcoplasm are the
A. sarcoplasmic reticulums.
B. myoglobins.
C. sarcolemmas.
D. T tubules.
Answer: D
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Airway passages have smooth muscle cells that are unique in that they have two receptor sites on their outer membrane. One receptor site accepts ACh as the neurotransmitter. When excited it causes the smooth muscle to contract. The second site accepts NE and the inhibitory effect is that the ACh dilates the airway.
What will be an ideal response?
Cellular responses to hormones that initiate second-messenger systems include ________
A) possible activation of several different second-messenger systems B) hormone binding to intracellular receptors C) cyclic AMP phosphodiesterase formation of an active second messenger D) formation of a specific protein kinase that acts on a series of extracellular intermediates
Which of the following promotes fluid movement from the interstitial spaces into the lumen of the capillaries?
1.Capillary blood pressure 2.Venous blood pressure 3.Plasma-colloid osmotic pressure 4.Interstitial fluid-colloid osmotic pressure 5.All of these are correct.
The anatomical left and right lobes of the liver are separated on the diaphragmatic surface of the liver by which of the following structures?
(A) fissure for the round ligament of the liver (B) fissure for the ligamentum venosum (C) falciform ligament (D) porta hepatis (E) lesser omentum