Explain the role of acetylcholine in the excitation phase of excitation-contraction coupling
What will be an ideal response?
Acetylcholine is a neurotransmitter responsible for triggering changes in skeletal muscle cells. When released by axon terminals into the synaptic cleft, acetylcholine binds to ligand-gated ion channels in the motor end plate of the skeletal muscle. Upon binding the receptors, sodium ion channels open and sodium ions enter the muscle fiber to produce a local depolarization in the skeletal muscle leading to the muscle cell's action potential.
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Which of the following is true about the mammary glands?
A) They are not sexual organs, though they are impacted by sex hormones. B) They are part of the female reproductive system. C) They are sexual organs that do not have direct reproductive function. D) They have no relationship to the female reproductive system.
If the cerebrum was no longer able to communicate with the midbrain, what type of tract would you suspect has been damaged?
A. Commissural B. Projection C. Association D. Ascending
Identify the material that would NOT be considered an important inorganic substances in our bodies.
A. Iron B. Oxygen C. Glucose D. Calcium
Yuri is working with a chemical in lab. This chemical is composed of repetitive units that include a phosphate group, a nitrogenous base, and a sugar known as ribose. He is working with:
A) a nucleic acid. B) a lipid. C) a carbohydrate. D) a protein.