Muscular Me Flashcards
What role does tropomyosin play in the muscular system?
Tropomyosin cover the actin, blocking the ability of myosin to attach to actin.
A person’s actin molecules are covered with excess tropomyosin. How will the position of tropomyosin affect muscle contraction?
Tropomysion will inhibit myosin to attach with actin.
Which connective tissue surrounds the fascicles?
Perimysium
The A-band of a sarcomere contains dark striations. These striations come from which muscle fiber(s)?
Actin and Myosin
Which structure is found at the ends of each sarcomere?
Z-line
Which of the following must occur to signal a muscle contraction?
An action potential must reach the muscle cell
What is happening when a muscle undergoes “spasticity”?
The muscle contracts continuesly due to UMNL
Smooth muscle is_________________. Cardiac muscle is________________. Skeletal muscle is
__________________.
.
Involuntary Involuntary Voluntary
What is the most effective way to increase the rate of muscle contraction?
Increasing calcium levels
Which branch of the nervous system works most closely with skeletal muscles?
Motor nervous system
A group of muscle fibers is called a musclethat wraps a muscle fibers sacromere
__________________? which means “bundle”.
Fasicles
Which type of muscle has the greatest amount of endurance?
Cardiac Muscle
Order the muscle tissues from the outermost tissue to the innermost tissue…
Epi Peri Endomysium
A person is taking calcium supplements and accidentally takes more tablets than the normal amount, causing his intracellular calcium level to go very high! What effect will high levels of calcium have on the position of tropomyosin and muscle contraction?
Tropomyosin will move out of the way and muscle contraction will occur
Muscle contraction involves multiple specialized proteins and energy expenditure. Which of the following statements best summarizes a muscle contraction?
Tropomysin will slide out and get energized by ATP
As women get older, they are often susceptible to hypocalcemia, or calcium-deficiency disease. How would low levels of calcium affect the proteins responsible for muscle contraction?
Myosin will not be able to bind with actin because troponin holds tropomyosin into place of actin
The muscular system and the nervous system work together to carry out muscle contraction. How does the sarcoplasmic reticulum interact with the nervous system?
The reticulum releases calcium ions upon detecting action potential
Which area of the sarcomere contains both actin and myosin filaments?
A- Band
Analysis of a video of a sarcomere reveals the Z-lines to be moving closer together. Which of the following is occurring?
The actin fibers are moving closer together, meaning contracting a muscle
A man suffers from cardiac arrest because his coronary artery is clogged. What sort of muscle is associated with coronary arteries?
Smooth muscles
A woman damaged an upper motor neuron in an accident. Which of the following is not expected to happen in the neuromuscular system?
Schwann cell will begin to deteriorate
Which of the following is a strategy of inotropy to ensure that more myosin heads are working in muscular contraction?
Making troponin C sensitive to calcium
The human heart beats under involuntary control. Which of the following nervous structures is most likely to regulate the heart?
Sympathetic Ganglia
A voracious raccoon is chasing you after you threw a rock at it. Which branch of your nervous system is activated and primarily involved in helping you to run away?
Sympathetic Nervous System
How does vasodilation help to cool the body?
Vasodilation : blood vessels to expand allowing more fluids to the skin
What are the characteristics of Type 1 and 2 Muscle fibers?
Type 1 muscle fibers move through aerobic respiration while type 2 muscle fibers move through anaerobic respiration.
Type 1 muscle fibers contain mitochondria.
Type 1 muscle fibers are red in color. They have a slow contraction speed with long duration, are fatigue resistant. Type 2 muscle fibers are white in color, have fast contraction speed, contract for a short duration, conduct contractions with strong power, and fatigue easily.
Muscle structure…
Bones are attached to muscles through tendons.
The epimysium wraps around the entire muscle
Within a fascicle, there are many muscle fibers
Structure A is a bone. Structure B is the perimysium. Structure C is a blood vessel. Structure D is a muscle fiber. Structure E is a fascicle. Structure F is the endomysium. Structure G is the epimysium. Structure H is a tendon.
During muscle contraction, which part of the sarcomere appears to disappear from sight?
H- band
Which area of the sarcomere contains both actin and myosin filaments?
A band
Consist of elongated cell called muscle fibers that can use ATP to generate force.
Muscular Tissue
