pairs of muscles that work together so that when one muscle contracts, the other relaxes; they pull in opposite directions
when a muscle becomes weak and shrinks when it is not used much
muscle on the top of the upper arm
a special substance that carries nutrients throughout your body
found in the heart; involuntary muscles
these muscles open the joint wider; straightening at the joint
even thinner strips of cells inside the myofibrils
these muscles close the joint; bending at the joint
largest muscle in the body that connects the femur and the pelvic girdle
How do you keep your cardiac muscles strong?
By elevating your heart rate for 30 minutes or more several times a week
the strongest muscle in body which allows humans to open and close their mouths
skeletal muscle cell that are long and thin
when muscles are partially contracted
strands of protein that are found in each muscle fiber
Name two places in your body where you find smooth muscles
Blood vessels, stomach, intestines, and bladder
when a person is unable to move a part of their body
rapid eye movement sleep (REM sleep)
part of the sleep cycle where your eyes move a lot; there is high brain activity and relaxation of the large muscles
when voluntary muscles move automatically without you consciously thinking about it
attach to bones and allow you to move
these muscles have no striations or stripes; they can be found in blood vessels, stomach, intestines or bladder
the stripes in skeletal muscles
a painful occurrence when tendons get inflamed from overuse
strong, flexible fibers that attach bones to skeletal muscles
a disease which begins with the masseter tightening and preventing the jaw from opening; it is also called lockjaw
muscle on the bottom of the upper arm
muscles you can control by thinking about it
What are antagonistic muscles?
Muscles that work opposite of each other.
What are tendons?
The tough fibers that connect your skeletal muscles to your bones.
What are the three kinds of muscle tissue in your body?
Skeletal, smooth and cardiac
What do muscle cells have a lot of that give them energy?
What do muscles need to grow?
Protein and exercise
What is muscle tone?
Partial contraction of your muscles throughout the day.
What things did we discuss that help muscles move?
Glucose, oxygen, vitamins and minerals
Where is your Achilles tendon?
In the back of your ankle.
Which of those muscle kinds are voluntary and which are involuntary?
Skeletal muscles are voluntary smooth and cardiac are involuntary.