問題一覧
1
What is a sarcomere?
Unit within a myofibril
2
What Are the Major Proteins Forming the Myofibrils Of Skeletal Muscle Cells?
Actin and myosin
3
What Structures Form a Motor Unit?
One motor neuron and several muscle fibers
4
By What Means Does an Electrical Impulse Travel Deep Into a Skeletal Muscle Fiber in Order to Trigger a Contraction?
Via transverse tubules
5
How Is Creatine Phosphate Used By Muscle Cells?
It is used to regenerate ATP.
6
What Binds to Actin at Its Binding Sites, Allowing the Formation Of Cross-Bridges?
Myosin
7
The Characteristic Reddish Color Of Skeletal Muscle Is Due to the Presence Of What Substance?
Myoglobin
8
What Is a Threshold Stimulus?
Minimum strength of stimulus required to cause muscle fiber contraction to occur
9
What Term Refers to the Increase in the Number Of Motor Units Activated As a Result Of More Intense Stimulation?
Recruitment
10
Compared to Skeletal Muscle, Smooth Muscle Contracts __________ and Relaxes __________.
more slowly; more slowly
11
What Term Refers to the Attachment Point For the Movable End Of the Muscle?
Insertion
12
What Term Describes the Muscle That Is Primarily Responsible for Opposing a Particular Action?
Antagonist
13
Layers Of Dense Connective Tissue Called __________ Separate And Support Individual Muscles.
Fascia
14
What are Fascicles?
Bundles of muscle fibers
15
What Is an Alternate Name For a Skeletal Muscle Cell?
Muscle fiber
16
What Is the Main Component Of Thin Filaments?
Actin
17
What Structure Within a Skeletal Muscle Cell Extends From Z Line to Z Line?
Sarcomere
18
What Is the Name Of the Functional Connection Between a Motor Neuron And a Muscle Cell?
Neuromuscular junction
19
Motor Neurons Communicate With Muscle Cells By Releasing Chemicals Called ____________.
neurotransmitters
20
When Acetylcholine Binds to Its Receptors At the Motor End Plate, the Muscle Fiber Membrane Becomes More Permeable to __________.
Sodium
21
What Is the Effect Of an Increased Concentration Of Calcium Ion In the Sarcoplasm?
Actin binding sites become exposed.
22
What Molecule, Only Present In Muscle Cells, Is Used to Temporarily Store Oxygen For Use In Aerobic Respiration?
Myoglobin
23
The Connective Tissue Covering That Separates a Muscle Into Fascicles Is Called the __________.
perimysium
24
What Is the Effect Of ATP Binding to Myosin?
Cross-bridges break
25
In Skeletal Muscle Fibers, What Is the Source Of the Calcium Ions That Are Released Into the Sarcoplasm to Bind With Troponin, Resulting In Contraction?
Sarcoplasmic reticulum