Functions of Muscles
What is the contractile unit of a muscle cell?
sarcomere
What is the name for the most superficial connective tissue in a skeletal muscle?
epipmysium
What is the name for the space between the axon terminal and a muscle fiber?
synaptic cleft
What attaches skeletal muscles to bones?
tendons
What are the three types of muscle tissue?
smooth, skeletal, and cardiac
The ________ ____________ theory describes how a muscle cell contracts (shortens).
sliding filament
What is a bundle of muscle cells called?
fascicle
This is the filament that moves toward the center when a sarcomere shortens.
thin filament or actin
What type of protein fiber allows a sarcomere to spring back to relaxed condition?
elastic
This type of muscle is under voluntary control
skeletal muscle
Name the 3 functions of muscles
motion, stabilizing body posture, and heat production
Where is the quadriceps group of muscles found in your body?
anterior thigh
This area gets larger when a sarcomere shortens.
zone of overlap
This is the name for a group of muscles that are stimulated by one neuron (nerve cell)
motor unit
These are the 2 types of muscle tissue that have striations.
skeletal and cardiac
What is the neurotransmitter at a NMJ?
Where are the adductor muscles found in the body?
Medial (interior) thigh
Where is calcium stored in a muscle fiber?
sarcoplasmic reticulum
This is the name for muscles get larger in diameter because they have increased the number of protein fibers in their muscle cells.
hypertrophy
This is the type of muscle that is more developed in long distance runners.
slow twitch muscles
What must occur for a muscle fiber to stop contracting?
Calcium is pumped back to terminal cisternae and is not longer attached to troponin.
Name the muscles in the hamstring group.
Biceps femoris, semitendinosus, semimembranosus
What stimulates calcium being released into sarcoplasm?
action potential traveling down a T-tubule
Name 2 things that long distance runners can gain more of in their muscle fibers.
more mitochondria, more myoglobin, more capillary networks
What are the junctions between cardiac muscles cells called?
intercalated discs