Which of the following describes voluntary muscle tissue

25 Jun Which of the following describes voluntary muscle tissue

Question
1 of 50

Which of the following describes voluntary muscle tissue?
Smooth muscle
Cardiac muscle
Skeletal muscle
Dense irregular
Dense regular

Question
2 of 50

What does endomysium cover?
Smooth muscle only
Fascicles of muscle cells
An entire muscle
An individual muscle cell
Myofibrils

Question
3 of 50

What is the name of the plasma membrane of a skeletal muscle cell?
Sarcoplasm
Myofilament
Sarcomere
Sarcoplasmic reticulum
Sarcolemma

Question
4 of 50

Which of the following describes a sarcomere?
The contractile unit between two Z discs
The area between two intercalated discs
The wavy lines on the cell, as seen in a microscope
The nonfunctional unit of skeletal muscle
A compartment in a myofilament

Question
5 of 50

Which of the following lists the structures of the skeletal muscle in order from largest to smallest?
Fascicle Myofilament Muscle fiber (cell) Myofibril
Sarcomere
3, 2, 5, 4, 1
1, 3, 4, 5, 2
2, 5, 4, 3, 1
3, 1, 2, 4, 5
1, 4, 3, 2, 5

Question
6 of 50

What is acetylcholine?
A source of energy for muscle contraction
A component of thick myofilaments
An oxygen-binding protein
A neurotransmitter that stimulates skeletal muscle
An ion pump on the postsynaptic membrane

Question
7 of 50

What is the name of the gap between the axon terminal of a motor neuron and the sarcolemma of a skeletal muscle cell?
Cross bridge
Sarcomere
Synaptic cleft
Neuromuscular junction
Motor unit

Question
8 of 50

Why are calcium ions necessary for skeletal muscle contraction?
Calcium increases the action potential transmitted along the sarcolemma.
Calcium initiates the depolarization of the sarcolemma.
Calcium triggers the binding of myosin to actin.
Calcium makes the membrane more permeable to sodium ions.
Calcium causes ATP binding to actin.

Question
9 of 50

What generates the mechanical force of contraction?
The “accordion-like” folding of thin and thick filaments
The temporary disappearance of thin filaments
The shortening of the thin filaments
The sliding of thin filaments past thick ones
The shortening of the thick filaments

Question
10 of 50

What does a motor unit include?
Muscle fibers only
Motor neurons only
Several motor neurons and one muscle fiber
Several muscle fibers and one motor neuron
One muscle fiber and one nerve

Question
11 of 50

Which of the following describes when a muscle contracts so completely that no relaxation is seen while the contraction is sustained?
Tetanus
Incomplete tetanus
Twitch
A normal contraction
Summation

Question
12 of 50

How can the condition of skeletal muscle fatigue best be explained?
The inability to generate sufficient quantities of ATP due to feedback regulation of synthesis
Insufficient intracellular quantities of ATP due to excessive consumption of oxygen
The all-or-none law
The total lack of ATP
Inadequate numbers of mitochondria

Question
13 of 50

Anaerobic glycolysis occurs when which substance is lacking?
Glucose
Oxygen
ATP
Lactic acid
Carbon dioxide

Question
14 of 50

What do isometric contractions produce?
Contractions and shortening, but not movement
Movement
Contractions
Contractions and movement, but not shortening
Muscle shortening

Question
15 of 50

What is the name of the movement that decreases the angle between two bones?
Abduction
Flexion
Circumduction
Extension
Rotation

Question
16 of 50

While doing “jumping jacks” during an exercise class, the arms and legs move laterally away from the midline of the body. What is this motion called?
Adduction
Extension
Abduction
Circumduction
Flexion

Question
17 of 50

What is the name of a muscle group that works with and assists the action of a prime mover?
Antagonist and synergist
Fixator only
Antagonist only
Synergist only
Antagonist and fixator

Question
18 of 50

Which of the following muscles are examples of antagonists?
Biceps brachii and triceps brachii
Vastus medialis and vastus lateralis
Gastrocnemius and soleus
Masseter and temporalis
Biceps femoris and biceps brachii

Question
19 of 50

Which of the following muscle(s) closes the jaw?
Sternocleidomastoid
Zygomaticus
Buccinator
Frontalis
Both masseter and temporalis

Question
20 of 50

Which one of the following is the action of the orbicularis oris?
Pulls the lower lip down and back.
Allows blinking, squinting, and various other protective mechanisms for the eye.
Draws the eyebrows together.
Closes the jaw.
Closes, purses, and protrudes the lips.

Question
21 of 50

Which one of the following muscles is involved in abduction of the arm at the shoulder joint?
Triceps brachii
Biceps brachii
Pectoralis major
Deltoid
Latissimus dorsi

Question
22 of 50

Which of the following is a muscle located on the ventral (anterior) side of the body?
Pectoralis major
Occipitalis
Gluteus medius
Latissimus dorsi
Gastrocnemius

Question
23 of 50

What is the main function of the quadriceps femoris group?
Thigh abduction
Foot inversion
Arm flexion
Hand supination
Knee extension

Question
24 of 50

Which autoimmune muscle disease results from a shortage of acetylcholine receptors at the neuromuscular junction and leaves the patient with generalized muscle weakness and fatigue?
Multiple sclerosis
Muscular dystrophy
Scoliosis
Myasthenia gravis
Spina bifida

Question
25 of 50

What does the term central nervous system refers to?
Spinal cord and spinal nerves
Brain, spinal cord, and cranial nerves
Brain and spinal cord
Autonomic and peripheral nervous systems
Brain and cranial nerves