end of chapter quiz: chapter 6 Flashcards
Muscles that oppose each other and produce opposite movements are described as:
a. synergistic
b. antagonistic
c. cooperative
d. oppositional
B.
Which of the following choices arranges the structures from
the largest (most inclusive) to smallest? (1) muscle fiber,
(2) fascicle, (3) myofibril, and (4) muscle
a. 1-2-3-4
b. 2-3-1-4
c. 4-2-1-3
d. 4-2-3-1
c.
. Skeletal muscles are attached to the bones by the ________,
from ________ to ________.
a. fascia . . . origin . . . insertion
b. tendons . . . origin . . . insertion
c. myofibrils . . . origin . . . tendons
d. smooth muscles . . . insertion . . . origin
b.
Muscles relax when:
a. calcium is present
b. nerve activity ends
c. sarcomeres shorten
d. Z-lines draw closer
B.
Botulism toxin inhibits the release of acetylcholine at the
neuromuscular junctions. What effect does this have on the
muscle activity?
a. Muscles will contract continuously.
b. Muscles will contract sporadically, without conscious
control.
c. Muscles will not contract because they will not receive nerve
stimulation.
d. There will be no effect on muscle activity
C/
The sliding filament mechanism describes the process during
which:
a. actin and myosin slide relative to each other
b. sarcomeres slide relative to each other
c. troponin and tropomyosin slide relative to each other
d. muscle fibers slide past each other
a.
What is the first and most direct energy source for muscle contraction?
a. glucose
b. ATP
c. creatine phosphate
d. glycogen
B.
Which of the following muscles can only be stimulated by
a nerve cell?
a. smooth muscle
b. cardiac muscle
c. striated muscle
d. skeletal muscle
D.
All of the following may happen in response to exercise training
except:
a. increase in the number of myofibrils
b. increase in the storage of glycogen and creatine phosphate
c. increase in the number of muscle fibers
d. increase in the number of mitochondria
C.
Which of the following is/are characteristic of slow-twitch fibers?
a. large amounts of glycogen storage
b. myoglobin content enables oxygen storage
c. numerous mitochondria
d. both (b) and (c)
D
Which of the following is the site of calcium ion storage within
muscles?
a. T tubules
b. sarcoplasmic reticulum
c. actin filaments
d. myosin filaments
B.
What is the role of ATP in muscle function?
a. ATP provides energy that enables myosin to form crossbridges with actin.
b. ATP enables myosin to detach from actin.
c. ATP provides energy to transport calcium back into
storage.
d. all of the above
D.
________ fibers can temporarily store ________ in myoglobin.
a. Fast-twitch . . . ATP
b. Slow-twitch . . . oxygen
c. Fast-twitch . . . oxygen
d. Fast-twitch . . . calcium
B
. Which type(s) of muscle cells can contract the fastest?
a. smooth muscle cells b. cardiac muscle cells
c. skeletal muscle cells
d. All muscle cells can exhibit the same speed of contraction.
C
. If a muscle is stimulated at a frequency that is higher than
normal, it contracts ________.
a. with more tension
b. faster
c. with less tension
d. slower
A.
