muscles

What type of organ are muscles?

contractile organ

what types of movements are muscles responsible for?

voluntary and involuntary

What are some examples of voluntary movements?

flexing muscles, walking, talking

What are some examples of involuntary movement?

spams, reflexes, seizures, and our diaphragm (hiccups)

what is the function of muscles?

to stabilize joints, maintain posture, produce movement, move substances within body, producing heat, stabilizing body position, and regulating organ volume

What are the characteristics of muscles?

excitability, contractibility, extensibility, and elasticity

What is excitability?

to receive and respond to stimuli

What is contractibility?

ability to shorten and thicken

what is extensibility?

ability to stretch

what is elasticity?

ability to return to its original shape after contraction or extension

What is muscle composed of?

cells held together by connective tissues

what does muscles connect?

Musccles connect the skeletal system to skin, skin, and obviously other muscles

What do muscle fibers receive from the central nervous system (brain)?

electrical impulses

What are the electrical impulses converted into?

mechanical energy (movement)

What is the difference between voluntary and involuntary responses?

Voluntary is controlled by a conscious thought, whereas involuntary is controlled by the brain and is automatically regulated

what are some examples of voluntary responses?

chasing a ball, sitting down when asked

what are some examples of an involuntary response?

blinking, heart beating, panting, digestion

what are tendons?

strong elastic fibers that connect muscle to bone

How does muscle movement affect tendons?

when muscles flex, tendons contract, and pull on bone forcing movement. When muscles relax, tendons relax.

what are ligaments?

strong fibrous tissue that connects bone to bone, and aids in keeping structures together and stable.

what is muscle contraction called?

sliding filament theory

what are muscles made up of (sliding filament)

think and thin proteins called filaments

in sliding filament theory, what are the lines we see called?

striations

What are thin filaments made of?

Actin

what are thick filaments made of?

Myosin

when muscle contraction happens, what happens in the sliding filament theory

thick and thin filaments slide past each other