Graded potentials that increase the likelihood of an action potential bring the ________ closer to threshold.
Fill in the blank(s) with the appropriate word(s).
membrane potential
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The face, head, and cheeks are located in a dermatome supplied by nerves from what spinal cord region?
A) sacral B) thoracic C) cervical D) lumbar E) No spinal nerves innervate the dermatome containing the face.
In mammals, the __________ is the main blood vessel leading from the heart to the lungs
Fill in the blank with correct words.
The radiology and surgical suite may be potentially harmful to staff and patients
Indicate whether the statement is true or false
Which of these does not contribute to the cessation of the signal in a synaptic transmission?
A) Neurotransmitter escapes from the synapse into the nearby extracellular fluid. B) The synaptic knob reabsorbs some neurotransmitters by endocytosis. C) Synaptic vesicles secrete neurotransmitter by exocytosis. D) Neurotransmitters are no longer released. E) Enzymes in the postsynaptic cell break down some neurotransmitters.