Muscles VB Quizzes
The neurotransmitter released by motor neurons that stimulates skeletal muscle is called
acetylcholine
The binding of __________ to the receptor on an ion channel causes the channel to open, allowing an influx of __________ ions into the muscle fiber.
acetylcholine, sodium
Sarcomeres contain
actin and myosin filaments
Which of the following statements about muscle tissues are true
cardiac and smooth muscle respond to involuntary nervous signals, cardiac muscle is found only in the heart, smooth muscle of the esophagus contracts in peristaltic waves
Smooth muscle can be found in which of the following systems
circulatory, respiratory, and digestive
smooth muscle does all of the following except
contract voluntarily to move blood through the vasculature
The __________ is a conical pouch formed by the upper and left portion of the right ventricle that leads to the pulmonary truck
conus arteriosus
Which best describes the structural components of skeletal muscle from largest to smallest
fascicle, fiber, myofibril, thick and thin filaments
All of the following statements about cardiac muscle are true, except
it is not striated
The outermost smooth muscle layer of the stomach is the
longitudinal layer
The proteins within a muscle cell are organized into large cells called
myofibrils
Which step of muscle contraction is called the "power stroke"
myosin heads move the actin filaments inward, shortening the sarcomere
The place where an impulse is transmitted from a motor neuron to a skeletal muscle is called the __________.
neuromuscular junction
The three types of muscle tissue are
smooth, cardiac, skeletal
All of the following are part of the cardiac conduction system, except
the chordae tendineae
Which of the following occurs when the myosin heads bind to actin
the cross bridges are established
Which layer of the heart wall lines the heart's internal structures and is continuous with the lining of blood vessels that attach to the heart?
the endocardium
Which of the following is the layer of the blood vessel wall that consists of smooth muscle and elastic fibers?
the tunica media
All of the following are characteristics of skeletal muscles, except
they are under involuntary control
Contractions of smooth muscle in the __________ wall propel urine into the bladder
ureter