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