Tema
Q:
Skeletal muscle fibers differ from "typical cells" in that these muscle fibersA) lack a plasma membrane.
B) have many nuclei.
C) are very small.
D) lack mitochondria.
E) all of the above
Q:
What neurotransmitter is released at the neuromuscular junction?
(A) norepinephrine
(B) acetylcholine
(C) serotonin
(D) dopamine
Q:
This type of neuron has one dendrite and one axon emerging from the cell body on opposite sides.
(A) Multipolar neuron
(B) Bipolar neuron
(C) Purkinje cell
(D) Unipolar neuron
Q:
Tetrodotoxin is a toxin that blocks the sodium channels from opening. What effect would this have on
the function of neurons?A) Neurons would depolarize more rapidly.
B) Action potentials would lack a repolarization phase.
C) The refractory period would be shorter than normal.
D) The neurons would not be able to propagate action potentials.
E) none of the above
Q:
During photosynthesis, producers convert light energy from the Sun into
nuclear energy
solar energy
mechanical energy
chemical energy
Q:
Examples of consumers include
A)
herbivores
B) carnivores
C) omnivores
D) all of the above
Q:
1. are autotrophic organisms with the ability to carry 0
photosynthesis and to make food for themselves.
A) Herbivores
B) Carnivores
C) Omnivores
D) Producers
Q:
The following are the main steps in the generation of an action potential.1. Sodium channels are
inactivated.
2. Potassium channels open and potassium moves out of the cell, initiating repolarization.
3. Sodium channels regain their normal properties.
4. A graded depolarization brings an area of an excitable membrane to threshold.
5. A temporary hyperpolarization occurs.
6. Sodium channel activation occurs.
7. Sodium ions enter the cell and depolarization occurs.
The proper sequence of these events is
A) \( 4,6,7,3,2,5,1 \)
B) \( 4,6,7,1,2,3,5 \)
C) \( 5,7,4,1,2,3,5 \)
D) \( 2,4,6,7,1,3,5 \)
E) \( 4,2,5,6,7,3,1 \)
Q:
Small phagocytic cells that are especially obvious in damaged tissue in the CNS are the
A) astrocytes.
B) Schwann cells.
C) oligodendrocytes.
D) microglia.
E) ependymal cells.
Q:
Nonstriated, involuntary muscle isA) cardiac.
B) red skeletal.
C) smooth.
D) white skeletal.
E) intermediate skeletal.
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