Chapter 10 - Muscular System

An entire muscle is wrapped in a connective tissue covering called the

• Epimysium

• Perimysium

• Endomysium

• Superficial fascia

• Muscle sheath

A muscle that is striated and contracts involuntarily is

• skeletal muscle

• Cardiac muscle

• Smooth muscle

• Found in the walls of blood vessels

• Attached to bones of the skeleton

A group of muscle cells enclosed by perimysium is called a(n)

• muscle

• aponeurosis

• fascicle

• sarcomere

• sarcolemma

The basic functional unit of a striated muscle fiber is the

• sarcolemma

• sarcoplasm

• sarcoplasmic reticulum

• sarcomere

• transverse tubule

The protein found in thick myofilaments is

• actin

• myosin

• tropomyosin

• troponin

• myoglobin

Sarcomeres are separated from one another by narrow zones of dense material called

• A bands

• H bands

• I bands

• B discs

• Z discs

Within the sarcomere, overlapping thick and thin filaments form a dark band called the

• A band

• H band

• I band

• B disc

• Z disc

A muscle fiber stores calcium ions in the

• lysosomes

• sarcoplasmic reticulum

• mitochondria

• transverse tubules

• the H zone

Synaptic vesicles contain

• acetylcholine (ACh)

• acetylcholinesterase (AChE)

• adenosine triphosphate (ATP)

• cholinesterase

• cyclic adenosine monophosphate (cyclic AMP)

Which of the following substances prevents continuous stimulation of a skeletal muscle fiber?

• ACh

• AChE

• ATP

• choline

• acetate