Exam 3 Study Guide Flashcards
Study Guide (27 cards)
What period is a muscle in when it is temporarily not able to respond to a stimulus?
Refractory Period
What is a Fasciculus ?
A bundle of skeletal muscle cells surrounded by a membrane called a Perimysium.
What type of proteins are actin and myosin?
Contractile Proteins.
What characteristic distinguishes or sets apart muscle tissue?
Muscle tissue has the special ability to contract or shorten.
What structure stores calcium in skeletal muscle cells?
Sarcoplasmic Reticulum
What would you expect to see when a sarcomere contracts and thin filaments move over thick filaments ?
The contact between the thin and thick filaments increases
What are the functions of muscle?
contract to produce movement, sustain body posture and position, maintain body temperature, store nutrients, and stabilize joint
How does muscle tissue remain active and healthy ?
Proper diet, daily use, exercise. Weight training
What is a cross bridge?
A cross bridge is the globular head of a myosin molecule that attaches to an actin filament in a muscle cell
What is the fibrous connective tissue surrounding the fascicles?
The connective tissue sheath covering each fasciculus is known as perimysium
What determines the power of a muscle?
Muscle Size
Muscle Fiber Type
Motor Unit Recruitment
Movement Speed
Type of Muscle Action
What propagates the action potential down the muscle fibers?
T-Tubules
What is the name of the plasma membrane of a muscle fiber?
Sarcolemma
Where are the Acetylcholine receptors in the Sarcolemma? What part?
Acetylcholine receptors are primarily located on the motor end plate of the sarcolemma
Where does the energy for muscle contraction come from?
ATP
What type of protein would troponin and tropomyosin be classified as?
regulatory proteins that control muscle contraction and relaxation
What is another name for a muscle fiber?
myofiber
What cell part would you expect to find a lot of in muscle cells?
large mitochondria
What is Myoglobin?
Myoglobin is a protein found in the heart and skeletal muscles that stores and delivers oxygen to muscle cells
What starts a skeletal muscle contraction?
the neuromuscular junction
What is the definition of a twitch?
a brief spasmodic contraction of the muscle fibers
What is the name of the condition in which hardening of the muscle fibers, caused by calcification occurs?
myositis ossificans
Where does a sarcomere begin and end?
The Z-line, or Z-disc, marks the beginning and end of a sarcomere
Why does rigor mortis happen?
necessary for the breakdown of actin-myosin filaments in the muscle fibers
