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APHY 101 Exam 3 Questions & Answers 2024

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What structure in skeletal muscle cells functions in calcium storage? - ANSWER-sarcoplasmic reticulum Creatine phosphate functions in the muscle cell by____________ - ANSWER-storing energy that can be transterred to ADR to resynthesize ATP During muscle contraction, myosin bridges attach to w...

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what is the role of tropomyosin in skeletal muscle

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APHY 101 Exam 3 Questions & Answers

What is the role of tropomyosin in skeletal muscles? - ANSWER-* Tropomyosin serves
as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.

What structure in skeletal muscle cells functions in calcium storage? - ANSWER-
sarcoplasmic reticulum

Creatine phosphate functions in the muscle cell by____________ - ANSWER-storing
energy that can be transterred to ADR to resynthesize ATP

During muscle contraction, myosin bridges attach to which active sites? - ANSWER-
actin filaments

The contractile units of skeletal muscles are_________ - ANSWER-Myofibrils

Sarcomeres are functional units of ____________ muscle - ANSWER-cardiac &
skeletal

What is the functional role of the T tubules? - ANSWER-enhance cellular
communication during muscle contraction

When a muscle is unable to respond to stimuli temporarily, it is in which of the following
periods? - ANSWER-*refractory period

Which of the following is the correct sequence of events for muscle contractions? -
ANSWER-motor neuron action potential neurotransmitter release, muscle cell action
potential, release of calcium ions from SR. ATP driven power stroke, sliding of
myofilaments

The sliding filament model of contraction involves_____ - ANSWER-actin and myosin
sliding past each other and partially overlapping

, The _______ is the main chewing muscle. - ANSWER-masseter

Which of the following is NOT a member of the hamstrings? - ANSWER-gracilis

What type of muscle assists an agonist by causing a like movement or by stabilizing a
joint over which an agonist acts? - ANSWER-a synergist

Which of the following muscles is NOT a rotator cuff muscle? - ANSWER-levator
scapulae

What is a muscle that provides the major force for producing a specific movement
called? - ANSWER-an agonist (prime mover)

Which of the following is NOT a function of dendrites? - ANSWER-generate nerve
impulses and transmit them away from the cell body

These cells in the CNS have cilia that move in order to circulate cerebrospinal fluid. -
ANSWER-- ependymal cells

Which of the choices below describes the ANS? - ANSWER-O motor fibers that conduct
nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands

Bipolar neurons are commonly_______ - ANSWER-found in the retina of the eye

Which of the following is NOT a characteristic of neurons? - ANSWER-They are mitotic.

Which ion channel opens in response to a change in membrane potential and
participates in the generation and conduction of action potentials? - ANSWER-voltage-
gated channel

The term central nervous system refers to the - ANSWER-brain and spinal cord

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