KIN 223 Exam-4

Hold your arm out so that it is completely extended. The triceps brachii is causing the extension, so it is acting as what?

Agonist

Which may occur as a result of muscle atrophy?

All of the choices are correct

Besides the supinator, which other muscle is a powerful supinator of the forearm?

Biceps brachii

Assign each characteristic to the appropriate type of muscle fiber. Fast Glycolytic Slow Oxidative

Fast Glycolytic - High glycogen content - Fast ATPase activity - Easily fatigued - Anaerobic Slow Oxidative - Red - Small fiber size - High myoglobin content - Many mitochondria

Which contraction occurs when you try (unsuccessfully) to move a wall?

Isometric

What type of contraction is represented by each of the following events? Isometric Contraction Isotonic Contraction

Isometric Contraction - A weightlifter attempts to lift a barbell but cannot because it is too heavy. - A man holds open a door for his date. - Tension is building but muscle length does not change. Isotonic Contraction - A sprinter leaves the starting block. - A mother lowers an infant into his crib.

Concentric contraction and eccentric contraction are both types of what major type of muscle tension?

Istonic contraction

label the erector spinae muscle groups in the figure.

Left- IIicostalis group Middle- Longissimus group Right/closes to the spine- Spinalis group

This figure shows a lateral view of the muscles of facial expression. What does number 1 indicate? "cheek"

Masseter

Which muscles help us in the initial breakdown of food?

Muscles of mastication

This figure shows the muscles of the anterior trunk. What muscle does umber 1 indicate? superficial/deep "superficial chest"

Pectoralis major

This figure shows the muscles of facial expression. What does number 1 indicate? Superficial- neck

Platysma

Label the anterior and posterior arm muscles in the figure. Posterior/Anterior View

Posterior view Top- Triceps bachii lateral head Middle- Triceps brachii long head Bottom/closes to elbow- Anconeus Anterior View Top- Biceps brachii long head Top (medial side)- Biceps brachii short head Middle/medial elbow- Brachialis Bottom- Brachioradialis

This figure shows the muscles of the abdominal wall. What muscle or feature does number 2 indicate? Superficial/Deep "six pack"

Rectus abdominis

Which is not one of the hamstring muscles?

Rectus femoris

Drag each muscle to the muscle group in which it belongs. Rotator Cuff Quadriceps Hamstrings

Rotator Cuff Supraspinatus Teres minor Subscapularis Quadriceps Rectus femoris Vastus intermedius Vastus lateralis Hamstrings Biceps femoris Semimembranosus

Which is the longest muscle of the body?

Sartorius

This figure shows a posterior view of the right thigh. What muscle does number 2 indicate? "slim/long/middle muscle"

Semitendinosus

This figure shows the muscles of the anterior neck. What muscle does number 3 indicate? superficial/deep

Sternocleidomastoid

The pronator teres and pronator quadratus cause pronation of the forearm. What muscle opposes this movement?

Supinator

Which of the following refers to a sustained muscle contraction?

Tetanus

Label the muscles of the forehead and muscles around the eyes int he figure.

Top of head- Epicranial aponeurosis Forehead/facial expression- Frontal belly of occipitofrontalis Top of nose/sinus- Procerus Side of nose- Nasalis Under eye- Orbicularis oculi

This figure shoes the muscles of the posterior trunk. What muscle does number 1 indicate? superficial/deep "superficial top back\neck"

Trapezius

Which muscle is the prime extensor of the elbow joint?

Triceps brachii

A moto unit consists of

a single motor neuron and the multiple muscle fibers it controls.

The action potential of a muscle fiber occurs

along the sarcolemma and down the T-tubules.

A muscle whose action opposes that of the prime mover is known as a(n)

antagonist.

The property of muscle tissue that allows an impulse to travel down the entire length of the cell membrane is

conductivity.

The muscle that forms a partition between the thoracic and abdominal cavities is the

diaphragm.

The function of the biceps femoris is to

extend the thigh and flex the leg.

Many of the muscles in the anterior compartment of the forearm work to _ the wrist, and they have their proximal attachment on the _ epicondyle of the humerus.

flex, medial

Muscle tone is a result of _ nervous system activity, and it acts to joint position.

involuntary, stabilize

Events of excitation contraction coupling, such as the release of calcium from intracellular stores, occur during the _ period of a muscle twitch.

latent

Label the components of skeletal muscle.

left side skeletal muscle fascicle right side Muscle fiber Myofibril

Consider the difference between lifting a light pad of paper versus a heavy textbook. the primary way the level of force of muscle contraction is controlled is by

recruiting a different number of motor units.

The abdominal muscle that extends vertically the entire length of the anteromedial abdominal wall and forms the traditional "six pack" is the

rectus abdominis.

Oxidative fibers are

red and fatgue-resistant.

The membranous network that wraps around myofibrils and holds relatively high concentrations of calcium is known as the

sarcoplasmic reticulum.

The rhomboid muscle is named for its

shape.

At the ends of muscles, the connective tissues merge to form a _, which attaches the muscle to other structures.

tendon.