What is the outermost layer of Connective Tissue that surrounds muscles?
Epimysium
In simple terms, what is a motor unit?
Where the muscular system meets the nervous system
What is the Neuromuscular Junction?
Where the synaptic end bulb comes in contact with muscle fiber to signal contraction
Step 1
Action potential arrives at the ___ of the motor neuron and causes the opening of ___
Synaptic end bulb
Voltage-Gated calcium channels
Define Spatial Summation
Recruitment of more motor units
What is the connective tissue layer surrounding individual Muscle fibers?
Endomysium
How many ____ are a part of a motor unit?
a) Motor Neurons (1 or multiple)
b)Muscle fibers (1 or multiple)
a) 1
b) Multiple
Identify these part of this image
E= Synaptic End Bulb
F= ACH(Acetylcholine)
Step 2
Synaptic vesicles containing neurotransmitter ___ undergo exocytosis
Ach
Acetylcholine
Define Isometric Contraction w/ and example
Tension w/ No change in muscle length
ex: Wall sit
What is the connective tissue that surrounds fascicles?
Perimysium
Describe the ___ of Slow Muscle fibers
a) Contraction speed
b) Force Production
c) Resistance to Fatigue
a) slow
b) small
c) High
Identify the parts of the image
A= Synaptic End Bulb
B= Synaptic Cleft
G= Sarco Plasm
H= Axon of Motor Neuron
Step 3
ACH is released into the ___ and binds to ___ on the ___
Synaptic Cleft
ACH Receptors
Motor end plate
Define Isotonic contraction w/ an example
Tension is constant while muscle length changes
ex: Bicep curl
Identify the odd numbers for this image
1= Muscle Fiber
3= Fascicle
5= Skeletal Muscle
7= Tendon
Describe the ___ of Fast Muscle fibers
a) Contraction speed
b) Force Production
c) Resistance to Fatigue
a) Fast
b) High
c) Low
Identify all parts of the Image
B= Voltage-gated calcium channels
C= Synaptic Vesicle
D= Motor End Plate
E= Synaptic end bulb
Step 4
___ open and allow ___ to enter the muscle fiber, in turn depolarizing the muscle fiber and generating an AP on the sarcolemma
ACH receptors
Na+ Ions/Sodium Ions
Define temporal Summation and the size principal
Increased frequency of contraction
Recruiting from smallest to largest for more force, Slow fibers > Fast Fibers with periods of spatial and temporal summation
Identify the Even Numbers for this image
2= Endomysium
6a= Perimysium
6b= Epimysium
a) Contraction speed
b) Force Production
c) Resistance to Fatigue
b) Medium
c) Medium
Identify the Parts of a muscle fiber
A= Synaptic End Bulb
B= Synaptic Cleft
C= Motor End Plate
D= Sarcolemma
E= Myofibril
F= Endomysium
Acetylcholine (ACH) is broken down by ___ into acetate and choline
Acetylcholine esterase
ACH esterase
What are the 2 types of isotonic contraction and define them
Concentric: The muscle is contracting and shortening
Eccentric: The muscle is contracting and lengthening