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Midterm 1 MC

Physiology 2420

QuestionAnswer
Which of the following chemical messengers is lipophilic and is therefore able to cross the cell membrane? eicosanoids
Lipophilic chemical messengers are poorly soluble in water. However, many of these lipophilic messengers are transported throughout the body. Their transport in blood (water) is facilitated. carrier proteins
Chronic exposure exposure to a ligand (messenger) ______________ to receptor population for that chemical messenger on the target cell. down regulates
What part of a neuron releases neurotransmitter by exocytosis? axon terminal
What region of the adrenal gland secretes epinephrine? medulla
When the response to two hormones is greater than the sum of the individual responses, the response is described as _______________. synergistic
A hormone is _________ when a second hormone is required for the first hormone to have any activity. permissive
What layer of the adrenal cortex secretes mineralcorticoids? zona glomerulosa only
What type of ion channels in the membrane of neurons allow ions to move across the membrane at rest and thereby contribute to resting membrane potential? leak channels
What type of cell enhances the velocity of electrical transmission of an action potential along an axon in the central nervous system? oligodendrocyte
At the resting membrane potential, the electrochemical gradient for sodium across the membrane is such that the net flux for sodium movement is directed ____________, thereby causing the cell's membrane potential to become more __________. inward; positive
The presence of the ________ prevents the dissipation of the concentration gradient for Na+. Na+/K+ pump
If, under resting conditions, the membrane is much more permeable to sodium than potassium, what would happen to the resting membrane potential? approach sodium's equilibrium potential
Which of the following events is faster? opening sodium activation gates, closing sodium inactivation gates, opening voltage-gated potassium channels, closing sodium activation gates opening sodium activation gates
The jumping of an action potential from node-to-node is called ____________. saltatory conduction
Axoaxonic synapses are responsible for __________ the extent of neurotransmitter released at the synapse. modulating
The binding of a neurotransmitter to its receptor at an inhibitory synapse can lead to the ________ of ___________ channels. opening; chloride
What two enzymes catalyze the breakdown of catecholamines? monoamine oxidase (MAO) and catechil-)-methyltransferase (COMT)
_____________ is an amino acid neurotransmitter at excitatory synapses whereas ___________ is an amino acid neurotransmitter at inhibitory synapses. aspartate; glycine
Created by: GracieLou