In response to a stimulus, a signal transduction pathway is initiated, which ultimately leads to the opening or closing of __________
Fill in the blank with the correct word.
Answer: Ion channels
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Saltatory conduction occurs in
A. myelinated axons, where action potentials occur only at neurofibril nodes. B. myelinated axons, where action potentials occur only under the myelin sheath. C. myelinated axons, where action potentials occur continuously down the entire axon. D. unmyelinated axons, where action potentials occur continuously down the entire axon. E. the axon terminal, where full-size action potentials occur at the hillock.
GLUT4 transporters are _________.
A) only found in adipose and skeletal muscles. B) stored in cytoplasmic vesicles and found in adipose and skeletal muscles. C) only inserted into the plasma membrane by endocytosis. D) only inserted in response to glucagon. E) only stored in cytoplasmic vesicles.
Dialysis uses the process of ________.
A. secondary active transport B. facilitated diffusion C. primary active transport D. simple diffusion
What part of the eye consists of three regions: choroid layer, ciliary body, and the iris?
A. Sclera B. Retina C. Uvea D. Pupil