Misc
What is a nueromuscular junction.
connects the nervous system to the muscular system via synapses between efferent nerve fibers and muscle fibers
What are the three types of muscle?
Smooth Muscle, Cardiac Muscle, and Skeltal muscle
What are poins of origin?
the attachment site that doesn't move during contraction
Why is myofibril?
any of the elongated contractile threads found in striated muscle cells.
What are points of insertion.
attachment site that does move when the muscle contracts.
What is an antagonist?
muscles that act as opposing muscles to agonists, usually contracting as a means of returning the limb to its original, resting position.
Describe skeletal muscle.
those which attach to bones and have the main function of contracting to facilitate movement of our skeletons
Describe cardiac muscle.
Found in the walls of the heart is also sometimes known as Involuntary muscle due to our inability to control its movements,
Describe smooth muscle.
sometimes known as Involuntary muscle due to our inability to control its movement
What s an agonist?
muscles that associate with motion itself by shortening with contraction to produce a movement
A ___________ is elastic bundles of tissue that perform different functions.
a. Tendons
b. Muscle
c. Ligaments
d. Joints
b. Muscle
what is circmduction?
movement of a limb or extremity so that the distal end describes a circle while the proximal end remains fixed
What is skeletal muscle responsible for?
a. Responsible for voluntary body movements.
b. Carries out mostly involuntary processes like digestion and pumping blood through arteries.
c. Prevents the actin from rubbing with the myosin.
d. Controls most involuntary movements
a. Responsible for voluntary body movements
Muscles that extend or straighten a body part.
a. Extensor
b. Flexor
c. Tendon
a. Extensor
How many muscles are there in the human body?
d. 640
what is rotation?
Act of turning in an axis.
What is acetylcholine and how does it affect muscle?
a compound that occurs throughout the nervous system, in which it functions as a neurotransmitter.
what is extension?
a movement that increases the angle between two body parts
Why do muscles contract a large number of mitochondria.
mitochondria produce ATP during aerobic respiration and ATP is needed for muscle to contract Without it, the mitochondria the muscle wouldn't be able to contract.
what is felxion?
a movement that decreases the angle between two body parts.
What is myocin?
a fibrous protein that forms (together with actin) the contractile filaments of muscle cells and is also involved in motion in other types of cells.
What is a bursae?
a fluid-filled sac or saclike cavity, especially one countering friction at a joint.
Describe muscle fibers?
A cylindrical, multinucleate cell composed of numerous myofibrils that contracts when stimulated.
What are aponeuroses?
a sheet of pearly-white fibrous tissue that takes the place of a tendon in sheetlike muscles having a wide area of attachment.
What is actin?
a protein that forms the contractile filaments of muscle cells, and is also involved in motion in other types of cells.