exam 5 Bio 209 Flashcards
which of the following is NOT a function of the autonomic nervous system
Innervation of cardiac muscle
B. innervation of smooth muscle of digestive tract
C. innervation of skeletal muscle
D. Innervation of glands
C. intervation of sketal muscle
which of the following is NOT a funtion of astrocytes
A. Support and brace Neurons
B. Guide the migration of young nerouns, synapase formation, and helping to determine cappilary permibilty
C. provide defense for CNS
D. Anchor neruons to blood vessels
C. provide defense for CNS
what does the central nervous system use to determine the strength of a stimulus
A. Ogrin of the stimulus
B. size of action potentials
C. frequency of action potentials
D. Type of stimulus receptor
D. Type of stimulus receptor
Bipolar neurons are commonly___
A. called neurogila cells
B. found in gangila
C. found in rentina of the eye
D. Motor neurons
C. found in rentina of the eye
which of the following is an excitory nerotransmitter secreted by motor neurons intervating sketal muscle
A. Acetycholine
B. Gamma aminobutyric acid
C. Cholinetearse
D. Norepinephrine
A. Acetycholine
What structure in sketal muscle cells funtions in calcium storage
A. Intermidite filament network
B. Myofibillar network
C. Mitochondria
D. Sacroplasm rectium
D. Sacroplasm rectium
During the relative refractory period of an action potential, a larger than normal stimulusis needed to cause another action potential. This is due to the fact that_____
A. the voltage gated potassium ion channels remain open long enough to hyperpolarize the axon membrane
B. the sodium potiasum pump will stop working during reltaive refractory
C. The membrane is now impermable to all ions
D. the inactionvation gates on voltage gated sodium ion channels ar closed
A. the voltage gated potassium ion channels remain open long enough to hyperpolarize the axon membrane
Rigor mortis occurs because
A. Sodium ions leak into the muscle causing continus contractions
B. proteins are beging to break down, thus preventing a flow of calcium ions
C. The cells are dead
D. No ATP is aviable to relase attached actin and myosin molecues
D. No ATP is aviable to relase attached actin and myosin molecues
myogoblin____
A. breaks down glycogen
B. is a protein involved in direct phosphorylation of ADP
C. Produces the end plate potential
D. Stores oxygen in muscle cells
D. Stores oxygen in muscle cells
The effect of acetylcholine can be stimulating or inhibiting. Which of the following gives the best explanation for why this is so.
A. Different post synaptic cells will have different receptors.
B. Acetylcholine has many different forms
C. Acetycholine has a does effect, larger does are stiumlating while small does inhibit
D. postsynaptic cells have a dynamic and changing metabolism and respond differntly at different times
A. Different post synaptic cells will have different receptors.
cell bodies of sensory neurons may be located in gangila lying outside the centeral nervous system
A. Ture
B. Flase
A.True
strong stimulus cause the strenth of action potentials generated to increase
A. True
B. Flase
B.flase
in myelinated axons the volatage- regulated sodium channels are concentrated at the nodes of ranvier
A. true
B. flase
A.true
An increase in the calcium ion level in the sacroplasm starts the sliding of the thin filaments. When the level of calcium ions declines, sliding stops.
A. true
B. flase
A.true
A resting potential is causeed by a diffrence in the concentration of certain ions inside and outside the cell
A. true
B. flase
A.true
