Chapter 10

Which of the following individuals would have more mitochondria in her skeletal muscle?

A 22-year-old soccer player

tentanus muscles is described as

Action potential frequency is high enough that no relaxation of muscle fibers occurs

A lack of mitochondria within a skeletal muscle fibers would impair, which ATP yielding chemical process?

aerobic respiration

When someone says to turn that frown upside down, they mean to relax your and contract your

Depressor annuli Oris lavator anguli oris

Which of the following events occurs during the lag phase of muscle twitch

The action potential is propagated from presynaptic to postsynaptic membrane.

In order for muscle relaxation to occur,

The active sites on an actin muscle must be blocked

The insertion is

The end of the muscle were the action occurs

A concentric contraction is described as

the muscle produces increasing tension as it shortens.

Excitation contraction coupling begins with?

the production of an action potential in the sarcolemma

Channels that open or close in response to changes in the electrical charge or voltage across the plasma membrane are called?

voltage-gated ion channels

Which of the following muscles of the chest has its insertion of the humerus

pectoralis major

The rectus femoris is an example of which muscle shape

pennate

Which of the following is a posterior thigh muscle?

biceps femoris

Which type of muscle tissue would cause flexion, and extension of the arm?

skeletal muscle

The model that describes the contraction of the muscle is called the

sliding filament model

Which type of muscle tissue has spindle shaped cells

smooth muscle

The bulge of the calf is caused by the ____ & ____ muscles.

gastrocnemius and soleus

The biceps femoris is part of the

hamstring muscles

Which of the following muscles is involved in chewing gum?

masseter

The H zone

Contains only myosin myofilaments

Some people suffer, involuntary urination due to incompetence of which muscle

External urethral sphincter

The terrace major and teres minor are not involved in

Flexion and adduction of the arm

The radial pulse can be felt just lateral to the tendon of the

Flexor carpi radialis

The adductor longus is named for its

Function and size

Which time muscle adducts the thigh, and flexes the knee

Graciilis

Troponin

Has a calcium binding site

Which of the following represents a class one lever system?

Hyper extension of the head

Smooth muscle and cardiac muscle are familiar in that they both

Are under involuntary control are striated have multiple nuclei

Of the following muscles of the forearm, which one rotates the forearm to turn the palm upwards?

Brachialis

Identify the statements concerning skeletal muscle that is true

It is responsible for locomotion

Infraspinatus

Laterally rotates the arm

Movement of the body are usually smooth and occur at differing rates because

Motor units contract out of phase at their own particular rates

Of the following muscles of the thigh, which one does not pull those like forward?

Rectus femoris

The abdominal muscles that has its origin at the public crust and symphysis pubis is the

Rectus, abdominis

In order to stabilize the hyoid so that the larynx can be elevated in swallowing, the __________ muscle group is used

Supra hyoid

Epimysium

Surrounds individual muscles

Which of the following is true concerning isotonic concentration contraction?

The muscle shortens, but tension remains constant

Whole muscles can respond in a graded fashion to stimuli by varying

The number of motor units recruited

Callie is a world class marathon runner. Which of the descriptions about her dominant type of skeletal muscle is FALSE?

They are well adapted to anaerobic activity.

Which of the following statements concerning fast twitch muscle fiber is true

They split ATP rapidly

Which of the following muscles is named for its shape

Trapezius

Which of the following muscles move the scapular

Trapezius

The orbicularis oculi muscle

causes crow's feet wrinkles

Lack of acetylcholinesterase in the synaptic cleft would result in

continuous stimulation of the postsynaptic membrane

The Zygomaticus major muscle

contributes to laughing and smiling.

Contraction of the inferior rectus muscle directs the pupil to look?

down

Acetylcholine is released from the presynaptic terminal by the process of?

exocytosis

The length of the resting sarcomere is

longer than the length of a contracted sarcomere.

Contracting the right sternocleidomastoid muscle would

rotate the head toward the left.

Maureen is hiking in the cold and to maintain homeostasis. Her body begins to.

to shiver