The quadriceps femoris is a composite muscle with four heads that work together to flex the leg
Indicate whether this statement is true or false.
FALSE
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A certain drug is known to block monovalent cation channels. This drug is used as a "muscle relaxer." Would it affect both smooth and skeletal muscles or only skeletal muscles? Defend your answer.
What will be an ideal response?
In a lab experiment with isolated lung cells you observe a linear uptake in choline from the extracellular medium by the cells until the extracellular concentration of choline reaches 200 nM. At this concentration the curve levels off and the same rate of uptake is seen at 200 and 225 nM extracellular choline. What has happened that can explain this observation?
a. Cellular and extracellular choline concentrations are at equilibrium. b. The transporters for choline saturate at 200 nM. c. At choline concentrations of 200 nM and above, the osmotic pressure of the cytoplasm prevents additional choline from entering the cell. d. The cell cannot synthesis enough ATP to keep up with the energy demand of the carrier. e. None of these.
The preparation of secretory vesicles for export from the cell is the responsibility of the ________
A) mitochondrion B) Golgi apparatus C) cytoskeleton D) peroxisome E) smooth endoplasmic reticulum
What are two reasons why the number of bones vary with age?
Bones are lost due to deterioration of calcium salts Sesamoid bones form within tendons in response to stress Some bones fuse together with age