MUSCLE 1 Flashcards
How many heart muscles are there?
1
Which muscle groups are voluntary types of muscles ?
Cardiac
Skeletal
Smooth
Skeletal
What type of muscles are connected to bones and present in sphincters ?
Skeletal
Are skeletal muscles striated of non-striated ?
Striated
Which muscle types are involuntary ?
Smooth
Skeletal
Cardiac
Smooth
Cardiac
Which type of muscle is present within the heart?
Cardiac
Are cardiac muscles striated or non-striated ?
Striated
Which type of muscle is present in visceral organs, blood vessels, eye, and piloerector
Smooth
Are smooth muscles striated or non-striated ?
Non-striated
Which muscle type has :
Elongated cell
Multiple peripheral nuclei
Visible striations
Voluntary
Skeletal
Which muscle type has :
Spindle shaped cell
Single central nucleus
Lack visible striations
Involuntary
Smooth
Which muscle type has :
Branching cell
Single central nucleus
Visible triations
Involuntary
Cardiac
Which muscle type has multiple nuclei ?
Smooth/skeletal/cardiac ?
Skeletal
Which muscle type has elongated cells ?
Skeletal
Smoot
Cardiac
Skeletal
Which muscle type has spindle -shaped cells
Smooth
Skeletal
Cardiac
Smooth
Which muscle type has branching cells ?
Skeletal
Smooth
Cardiac
Cardiac
Each fibre contains multiple skeletal muscle cells.
True or false?
False,
Each fibre consists of a single skeletal muscle cell
Each muscle is covered by dense connective tissue.
True or false?
True
Each ____ muscle cell has:
-multiple nuclei
-sarcoplastic reticulum and terminal cisternae contain Ca++
- t-tubule, axon-like fibre that transmits action potential into muscle
-myofibrils
Skeletal
Each skeletal muscle cell contains a_____ which is an axon-like fibre that transits action potentials into muscle
T-tubule
Each skeletal muscle cell contains _______ which are contractible element of muscle fibre
Myofibrils
____ display alternating dark and light bands giving appearance of striations
Myofibril
Myofibrils displays alternating dark bands (__ bands ) and light bands (___ bands)
A and I
Alternating dark and light bands displayed by myofibrils give appearance of ____
Striations
____ is the functional unit of striated muscle, found between 2 Z lines
Sarcomere
Myofibrils are comprised of regular arrangement of thick and thin filaments which slide against each other, changing muscle ____
Length
___ band :
Made up of thick filaments along with protons of thin filaments that overlap on both ends of thick filaments
A
__ zone
Lighter area within middle of A band where thin filaments do not reach
H
__Line
Extends vertically down middle of A band within centre of H zone
M
____band
Consists of remaining portion of thin filaments that do not project into A band
I
What section of sarcomere have the following :
___- thick filaments only
____- thin filaments only
_____-thick and thin filaments overlap
H zone
I band
A band
_______ consists of A band, H zone, M line and I band
Sarcomere
Neuromuscular transmission :
1. Motor neuron action potential activated the release of _____ into the space between nerve and muscle
Acetylcholine
Neuromuscular transmission:
2. Acetylcholine bind to ___ receptors on the muscle plasma membrane and is linked to a channel that opens, it lets out a lot of na+ into muscle cell
Nicotinic
Neuromuscular transmission :
2. Influx of Na+ depolarizers the cell to a threshold that activates fast na+ channels that produce an ________
Action potential
Neuromuscular transmission:
3. Action potential is transmitted along the plasma membrane through the _____ system causing the release of Ca2+ from the sarcoplasmic reticulum
T-tubule
Does force of contraction increase or decrease with muscle action potential firing frequency ?
Increase
Would an increase or decrease of the following produce in increased contraction :
1. Firing frequency of each motor neuron
2. Recruitment of motor neurons to fire
3. Recruitment of proportion of fast twitch muscle contraction
Increase
Increase
Increase
More motor nerve firing and fast twitch muscle firing produces greater _____
Contraction
Do slow fibers have :
Large or small amount of myoglobin?
Red or pale muscle colour ?
Large or small # of mitochondria ?
Fast or slow shortening velocity ?
Extensive or non-extensive blood supply ?
Activated at high or low work intensities ?
Easy or resistant to fatigue ?
Large
Red
Large
Slow
Extensive
Low
Resistant
Do fast fibers have :
Large or small amount of myoglobin?
Red or pale muscle colour ?
Large or small # of mitochondria ?
Fast or slow shortening velocity ?
Extensive or non-extensive blood supply ?
Activated at high or low work intensities ?
Easy or resistant to fatigue ?
Small
Pale
Small
Fast
non extensive
High
Easy
