Transcript 1. different degrees of skeletal muscle shortening

Agenda
12/2/13
• White board review
• EVERY student needs a white board
6. muscles use stored ____ for energy
A.
B.
C.
D.
ADP
Ca⁺⁺
ATP
All of the above
9. The contraction of all skeletal
muscle cells is due to the movement
of?
A.
B.
C.
D.
Thick filaments
Endomysium
Mitochondria
Thin filaments
10. This letter represents?
Be able to label this diagram, not on
answer key
11. The letters point to?
Be able to label this diagram, not on
answer key
12. The plasma membrane of skeletal
muscle cells is called ________
A.
B.
C.
D.
Sarcomere
Sarcolemma
T-tubule
Neuromuscular junction
13. Muscle tissue has the ability to
shorten when adequately stimulated,
a characteristic known as __________.
A.
B.
C.
D.
Contractility
excitability
Elasticity
Extensibility
14. The heads of the myosin Myofilaments are
called __________ when they link the thick and
thin filaments together during skeletal muscle
contraction.
A.
B.
C.
D.
Cross bridges
Creatine phosphate
A band
I band
15. gap between the motor neuron and the
muscle fiber it supplies at the neuromuscular
junction is called the __________.
A.
B.
C.
D.
Neuromuscular junction
Motor end plate
Axon terminal
Synaptic cleft
18. Voluntary muscle tissue is;
A) smooth muscle
B) skeletal muscle
C) dense regular
D) cardiac muscle
E) dense irregular
19. Endomysium covers:
A) fascicles of muscle cells
B) an entire muscle
C) an individual muscle cell
D) myofibrils
E) smooth muscle only
21. Which of the following is NOT a
function of the muscular system:
A) production of movement
B) maintenance of posture
C) stabilization of joints
D) generation of heat
E) Hematopoiesis
22. A Sarcomere is:
A) the nonfunctional unit of skeletal muscle
B) the contractile unit between two Z discs
C) the area between two intercalated discs
D) the wavy lines on the cell, as seen in a
microscope
E) a compartment in a Myofilaments
23. Which one of the following is
composed of myosin protein:
A) thick filaments
B) thin filaments
C) all Myofilaments
D) Z discs
E) light bands
24. An elaborate and specialized network
of membranes in skeletal muscle cells that
function in calcium storage is the:
A) sarcolemma
B) mitochondria
C) intermediate filament network
D) myofibrillar network
E) Sarcoplasmic reticulum
25. During skeletal muscle contraction,
myosin heads attach to active sites of:
A) myosin filaments
B) actin filaments
C) Z discs
D) thick filaments
E) the H zone
26. Neurotransmitters are released
upon stimulation from a nerve impulse
by the:
A) myofibrils
B) motor unit
C) thick filaments
D) axon terminals of the motor neuron
E) sarcolemma of the muscle cell
28. Which of the following can actually
shorten during a muscle contraction:
A) myosin filaments
B) A bands
C) actin filaments
D) Sarcomere
29. Place these structures of the skeletal
muscle in order from largest to smallest:
1.
2.
3.
4.
5.
fascicle
Myofilaments
muscle fiber (cell)
myofibril
Sarcomere
1, 3, 4, 5, 2
32. Why are calcium ions necessary for
skeletal muscle contraction:
A) calcium increases the action potential
transmitted along the sarcolemma
B) calcium releases the inhibition on Z discs
C) calcium triggers the binding of myosin to actin
D) calcium causes ATP binding to actin
E) calcium binds to regulatory proteins on the
myosin filaments, changing both their shape and
their position on the thick filaments
33. Acetylcholine is
A) an ion pump on the postsynaptic membrane
B) a source of energy for muscle contraction
C) a component of thick Myofilaments
D) an oxygen-binding protein
E) a neurotransmitter that stimulates skeletal
muscle
34. Which of these events must occur first
to trigger the skeletal muscle to generate
an action potential and contract:
A) sodium ions rush into the cell
B) acetylcholine (ACh) causes temporary
permeability to sodium
C) diffusion of potassium ions out of the cell
D) operation of the sodium-potassium pump
E) acetylcholinesterase (AchE) breaks down
acetylcholine (ACh)
Answers
•
•
•
•
•
•
•
•
•
•
•
C
D
B
A
A
D
B
C
E
B
A
•
•
•
•
•
•
•
•
E
B
D
D
1,3,4,5,2
C
E
B