You have dissected the heart and gastrocnemius muscle from a frog. You observe that ________
A) the gastrocnemius continues to contract, while the heart ceases to beat
B) both muscles contract on the dissection tray
C) the heart contracts spontaneously, while the gastrocnemius has not contracted at all
Answer: C
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According to the Frank-Starling law
the more calcium available to the heart cell, the more forcefully it will contract. B. as the volume of blood entering the heart increases, ventricular contractions become more forceful. C. the faster the heart rate, the larger the stroke volume. D. the greater the resistance from the arteries, the higher the blood pressure.
Match the following:
A) Depolarization B) Relative refractory period C) Action potential D) Absolute refractory period E) Repolarization ) The neuron cannot respond to a second stimulus, no matter how strong. 2) The interior of the cell becomes less negative due to an influx of sodium ions. 3) The specific period during which potassium ions diffuse out of the neuron due to a change in membrane permeability. 4) Also called a nerve impulse transmitted by axons. 5) An exceptionally strong stimulus can trigger a response.
The hematocrit represents the packed cell volume
Indicate whether the statement is true or false
The observation that there is a limit to how many times a cell can divide is the basis for the ________ theory of senescence
A) replicative B) abortive C) cross-linking D) autoimmune E) free radical