Pepsinogens are produced by parietal cells in the stomach
Indicate whether the statement is true or false
FALSE
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The following is a list of the events that occur during a muscle contraction. What is the correct sequence of these events? 1. Myosin cross-bridges bind to the actin. 2. The free myosin head splits ATP. 3. Calcium ion is released from the sarcoplasmic reticulum. 4. The myosin head pivots toward the center of the sarcomere. 5. Calcium ion binds to troponin. 6. The myosin head binds an ATP molecule
and detaches from the actin. A) 1, 3, 5, 4, 6, 2 B) 5, 1, 4, 6, 2, 3 C) 3, 5, 1, 2, 4, 6 D) 3, 5, 1, 4, 6, 2 E) 1, 4, 6, 2, 3, 5
If an electrical synapse conducted an action potential "backward" (from what would normally be the postsynaptic neuron to the presynaptic neuron), would an action potential be conducted in a retrograde direction (along the axon toward the cell body)?
a. Yes. b. No, since the normally presynaptic neuron lacks receptors for the ions carrying current from the normally postsynaptic neuron. c. No, since the normally presynaptic neuron would be refractory to retrograde conduction. d. No, unless the concentration gradients for all the relevant ions were reversed. e. No, since there's no axon hillock at the axon terminal of the normally presynaptic neuron.
If the permeability of the plasma membrane to K+ ions increases, the result is
A) depolarization of the plasma membrane. B) hyperpolarization of the plasma membrane. C) little, if any, change in the resting membrane potential of the plasma membrane.
The pectoralis major muscle is named for its action.
Answer the following statement true (T) or false (F)