Sliding Filament Theory
What does a motor unit consist of?
Muscle fibers and a motor neuron
What muscle is medial to the External Oblique?
Rectus Abdominis
This criterion refers to whether a muscle is under conscious control or not.
voluntary vs involuntary control
This muscle function allows opposing muscles to work together to produce smooth, controlled movement.
agonists and antagonists
What is the longest muscle in the human body?
Sartorius
What substance causes the actin to change shape?
Calcium
What muscle is anterior to the Triceps Brachii?
Biceps Brachii
This muscle criterion describes the visible banding pattern seen under a microscope.
striations
This function of muscle contraction helps stabilize joints without producing visible movement.
isometric contraction
The strongest muscle based on force
masseter
What is the gap between the neuron and muscle fibers called?
Synapse
This broad muscle located on the mid- to lower back helps with posture and arm movement.
Latissimus Dorsi
This criterion describes whether a muscle’s fibers are long and cylindrical or short and branched.
cell shape and structure
By converting chemical energy into thermal energy, muscles perform this essential function.
thermogenesis (heat production)
what is the smallest muscle in the body?
Stapedius
What happens to the calcium ions when the action potential has finished?
They are reabsorbed into the storage areas and the muscle cells relaxes and reverts to original length
This thin, strap-like muscle runs diagonally across the thigh from the anterior superior iliac spine to the medial tibia.
Sartorius
This criterion distinguishes muscle tissue that relies primarily on calcium released from the sarcoplasmic reticulum versus extracellular calcium.
source of calcium for contraction
This muscle function involves maintaining body position against gravity for extended periods.
postural maintenance
What is the average percentage of your body weight is muscle?
40%
List the steps in order for the Sliding Filament Theory
1 - Signal travels down the motor neuron
2 - Calcium released from sarcoplasm
3 - Actin changes shape
4 - Cross bridges form
5 - ATP creates a power stroke, shortening actin filament
What muscle originates on the ilium of the pelvis and inserts at the base of the patella?
the rectus femoris
This muscle criterion is used to identify tissue capable of rhythmic, self-stimulated contractions.
autorhythmicity
This muscle function decreases joint movement to protect joints during sudden or forceful actions.
joint stabilization
What muscle rarely gets tired?
The Heart