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
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
