Chapter 7 - The Muscular System

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Red muscles are slower than white muscles

True

Skeletal muscles contain blood vessels

True

Resting slow muscle fibers contain oxygen reserves, bound to myoglobin

True of slow fibers

In infants, which muscle allows for the mouth to form a tight fit around the nipple?

orbicularis ortis

The less moveable end of a skeletal muscle is the

origin

Quadriceps group contains

rectus femoris, vastus intermedius, vastus lateralis and vastus medialis

Each myofibril consists of approximately how many sarcomeres

10,000

Rigor mortis occurs due to lack of what molecule

ATP

If ACh is not released at axon terminals, what happens

Muscles are not capable of contracting

Action of the deltoid

abduct the arm

Myofibrils are made primarily of

actin and myosin

The striated appearance of skeletal muscle results from

actin and myosin arrangement

Muscles whose actions oppose one another

antagonists

Contains vesicles filled with acetylocholine

axon terminal

Muscle that allows you to do a pull up

biceps brachii

The enzyme acetylcholinesterase causes aceylcholine to

break down

In response to action potentials arriving from the transverse tubules, the sarcoplasmic reticulum releases

calcium ions

A muscle that inserts on the radial tuberosity or the ulnar tuberosity is most likely involved in

elbow flexion

Action of the trapezius

elevates, adducts, depresses or rotates the scapula

A layer of collagen fibers that surrounds and entire muscle

epimysium

Layer of collagen fibers that surrounds and entire muscle

epimysium

Action of the vastus lateralis and other quadriceps muscles

extension of the knee

Biceps femoris, semitendinosus and semimembranosus make up

hamstrings

Cardiac muscle tissue is

involuntary, contains branched cells and intercalculated discs

Characteristics of smooth muscle tissue

involuntary, lacks sarcomeres and is not striated

Where is the latissimus dorsi located?

lower back

Function of skeletal muscles

maintain body posture, produce bone movement, maintain body temperature

The specialized sarcolemma that contains acetylcholine receptors is the

motor end plate

The term for a single motor neuron and all the muscle fiber it controls

motor unit

The area between Z lines is the

sarcomere

The skeletal muscles store calcium ions in the terminal cisternae of the

sarcoplasmic reticulum

The muscle that produces the action of standing on tip toes

soleus

What is the function of a transverse tubule

transmit electrical impulses to the cell's interior

Large, superficial muscle covering the upper back and portions of the neck

trapezius

What muscle extends the elbow during a pushup?

triceps brachii

Tropomyosin strands are held in position by

troponin molecules

The muscle that originates along the entire length of the linea aspera of the femur

vastus medialis


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