Photopigments undergo chemical changes when light hits them
Indicate whether the statement is true or false.
TRUE
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Large doses of certain stimulants can lead to dangerous increases in heart rates. Such a stimulant is a
A. positive chronotropic agent. B. negative chronotropic agent. C. positive inotropic agent. D. negative inotropic agent.
What component of the cardiac conduction system distributes electrical signals through the papillary muscles directly?
a. AV nodes. b. AV bundle. c. bundle of His. d. Purkinje fibers. e. SA node.
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 floor of the pelvic cavity includes skeletal muscles that function to support organs in that cavity.
a. true b. false