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