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Exam of 6 pages for the course BIOS 256 at BIOS 256 (BIOS 251 exam)
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BIOS 251 & 252 COMP EXAMWhich of the following event will occur when depolarizing graded potential's reach the
membrane of the axon Hillock, causing its membrane potential to reach threshold?
A. Ligand-gated Ca++ channels close rapidly
B. Voltage-gated Ca++ channels open rapidly
C. Ligand-gated Na+ channels close rapidly
D. Voltage-gated Na+ channels open rapidly
E. Ligand-gated Cl+ channels close rapidly - answersD. Voltage-gated Na+ channels
open rapidly.
The attachment of the muscles tendon to the stationary bone is called the _________? ;
The attachment of the muscles other tendon to the movable bone is called
the__________?
A. Origin ; action
B. Insertion ; action
C. Origin ; insertion
D. Stabilizer ; mover
E. Insertion ; origin - answersC. Origin ; Insertion
The sarcoplasmic reticulum stores
A. Oxygen
B. Glycogen
C. ATP
D. Calcium ions
, E. Glucose - answersD. Calcium ions
Which of the following is NOT a function of smooth muscle tissue?
A. Altering the diameter of the respiratory passageways
B. Elevating hairs on the arm
C. Blinking the eyelid
D. Moving food materials along the digestive tract
E. Moving urine from the kidneys into the bladder - answersC. Blinking the eyelid
_________ is the summation of postsynaptic potentials in response to stimuli that occur
at different locations in the membrane of a postsynaptic cell at the same time
A. Cortical summation
B. Spatial summation
C. Temporal summation
D. Tactile summation
E. Olfactory summation - answersB. Spatial summation
An inhibitory neurotransmitter ________ the postsynaptic membrane
A. Depolarizers
B. Repolarizes
C. Hyperpolarizes
D. Reverses the polarity of the
E. Moves channels to the internal axonal membrane - answersC. hyperpolarizes
_______ cells function as immune/phagocytic cells within the central nervous system
A. Ependymal
B. Astrocytes
C. Microglial
D. Schwann
E. Oligodendrogital - answersC. Microglial
The myelin sheaths that surround the axons of some of the neurons in the centra
nervous system are formed by
A. Astrocytes
B. Oligodendrocytes
C. Microglia
D. Ependymal cells
E. Schwann cells - answersB. Oligodendrocytes
A muscle that provides the major force of producing a specific movement is called
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