Ch 11.1-11.4 Flashcards
muscle and nerve cells have developed which characteristic more than other cells? A. Movement B. Permeability C. Excitability D. Reproduction
C. Excitability
Because skeletal muscles is under the conscious control it is staid to be \_\_\_\_\_\_\_\_\_. A. Involuntary B. Smooth C. Voluntary D. Visceral
C. voluntary
Muscle cells contain __________, a starch-like carbohydrate that provides energy during intense exercise.
glycogen
What is myoglobin?
A. An enzyme found in the synaptic cleft
B. A molecule that stores oxygen in muscles
C. A carbohydrate that provides a muscle cell with energy
D. A hormone that triggers contraction
B. A molecule that stores oxygen in muscles
Which membranous structures conduct impulses through the sarcoplasm to stimulate the release of calcium?
A. Troponin
B. Sarcomeres
C. Myosin
D. T-tubules
D. T-tubules
A. troponin is a regulatory protein.
B. A sarcomere is the portion of the myofibril from one Z disc to the next; it constitutes one contractile unit.
C.Myosin is a contractile protein.
The characteristic that allows muscles to pull on bones and organs to create movement is called_____.
A. metabolism
B. Excitability
C. Contractility
D. Conductivity
C. Contractility
True or false.
The sarcoplasmic reticulum releases calcium through gated channels when the T-tubules are stimulated.
true
skeletal muscles exhibits alternating light and dark bands called_________.
striations
In a myofibril, a thick filament is composed of pairs of ___________ molecules intertwined together.
myosin
muscle cells contain _____________, a red pigment that stores oxygen need for muscular activity.
myoglobin
Thin filaments are primarily composed of which protein? A. F actin B. Elastin C. Dystrophin D. Myosin
A. F actin
what is the function of T-tubules?
A. to stimulate the terminal cisternae to release sodium
B. to stimulate the terminal cisternae to release calcium
C. to stimulate the terminal cisternae to release acetylcholine
B. to stimulate the terminal cisternae to release calcium
gated channels in the sarcoplasmic membrane open to release which ions into the cytosol? A. Sodium B. Phosphate C. Potassium D. Calcium
D. Calcium
In a thin filament, each tropomyosin molecule has a small calcium-binding protein called _________ bound to it.
troponin
Which protein makes up the thick filaments of a myofibril? A. Actin B. Tropomyosin C. Troponin D. Myosin
D. Myosin
within skeletal muscle cells, what extends from on Z disc to the next and constitutes one contractile unit? A. Thick filament B. Sacromere C. Terminal Cisterna D. T-Tubule
B. Sacromere