Muscles

neuromuscular junction

A motor neuron transmits the effect of a nerve impulse to the muscle fiber at a _________________.

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

A motor unit consists of: multiple motor neurons and the one muscle fiber they control. multiple motor neurons and multiple muscle fibers. one synaptic terminal button, a cleft, and an acetylcholine receptor. an end plate, T-tubule, and sarcoplasmic reticulum. a single motor neuron and the multiple muscle fibers it controls.

True

Cardiac muscle cells tend to be thicker and shorter than skeletal muscle cells

cardiac muscles are -short and branching -cells have one or two nuclei in the center of the cell -they are composed of thick and think filaments -functional unit is sarcomere

Check all that are characteristics of cardiac muscle. Cells are long and cylindrical. Cells are short and branching. Cells have multiple nuclei at the periphery of the cell. Cells have one or two nuclei in the center of the cell. They are composed of thick and thin filaments. The functional contractile unit is the sarcomere.

Flexion of vertebral column compression of abdominal wall

Check all that are functions of the muscles of the abdominal wall. Flexion of the vertebral column Extension of the vertebral column Compression of the abdominal wall Rotation of the hips

Fasicle

Each skeletal muscle is composed of _____________, which are bundles of muscle fibers.

Soleus

If you were to remove the gastrocnemius muscle you would expose the:

sarcomeres

Myofilaments within myofibrils are arranged in repeating microscopic cylindrical units called ____________.

Humerus

Rotator cuff muscles attach the scapula to the ____________.

False

Smooth muscle cells tend to be shorter but thicker than skeletal muscle cells. True False

False, the quadriceps femoris is made of 4 heads but its action is to... Extension of leg Flexion of thigh (rectus femoris only)

T or F, The quadriceps femoris is a composite muscle with four heads that work together to flex the leg.

origin

The _________ of a muscle is its less moveable attachment.

perimysium

The _____________ is the connective tissue covering of a fascicle.

endomysium

The _____________ is the innermost connective tissue layer that surrounds each muscle fiber.

temporalis

The broad, fan-shaped muscle of mastication that you can feel alongside your temple as you open and close your jaw is the __________.

sarcomere

The functional contractile unit of a skeletal muscle fiber is called a _______________.

Triceps Brachii

The large, three-headed muscle that is the prime extensor of the forearm at the elbow joint is the _____________

clavicle

The muscles that move the pectoral girdle insert on the scapula and the __________.

Sarcolemma

The plasma membrane of a skeletal muscle fiber is called the ______________.

motor end plate

The specialized region of the sarcolemma that has folds and indentations to increase the membrane surface area covered by the synaptic knob is the synaptic vesicle. synaptic cleft. motor end plate.

Antagonist

The stretching of the antagonist slows and controls the action of the agonist. The action of the antagonist opposes the action of the agonist.

biceps brachii

The supinator works synergistically with the _________ ___________ to supinate the forearm

biceps brachii?

The supinator works synergistically with the _________ ___________ to supinate the forearm.

cardiac muscle

The type of muscle fibers that are striated, form Y-shaped branches, and have junctions called intercalated discs are: skeletal and voluntary. voluntary. skeletal. smooth. cardiac.

True

True or False, Hamstring muscles extend the thigh.

Elevation of scapula (e.g., shrugging shoulders) Inferior rotation of scapula (directing glenoid fossa inferiorly) Lateral flexion of neck (when scapula fixed)

What does the levator scapula do?

Acromial end of clavicle & acromion and spine of scapula

What is the Origin of this muscle?

Flexion of the forearm

What is the action of the triceps brachii muscle?

coracoid process of scapula

What is the insertion of the pectoris minor?

Unilateral: rotation of trunk Bilateral: flexion of trunk (sit-ups) Compression of anterior abdominal wall and viscera (increases intra-abdominal pressure)

What is the purpose of the external oblique abs?

Biceps Femoris Short Head

What muscle is highlighted?

Vastus Lateralis

What muscle is highlighted?

infraspinatous

What muscle is highlighted?

a, b, c, d

Which is a correct listing of the hierarchy of a skeletal muscle's components, beginning with the smallest? a: Myofibrils b: Muscle fiber c: Fascicle d: Skeletal muscle

Serratus posterior superior External intercostals

Which of the following muscles elevate the ribs during inhalation? Check all that apply. Serratus posterior superior External intercostals Transverse thoracis Internal intercostals

biceps femuris

Which of the following muscles inserts on the head of the fibula? Semimembranosus Tensor fasciae latae Biceps femoris Gluteus maximus Semitendinosus

serratus posterior inferior and serratus posterior superior

posterior muscles the serratus posterior inferior makes a noodle shape on the bottom of the back and is larger and the serratus posterior superior makes a noodle shape on the top of the back but is smaller

adduction of the thigh extension of the thigh

what is the action of the adductor magnus

flexion of forearm and arm and supination of the forearm

what is the action of the biceps brachii?

extend the thigh flex the leg

what is the action of the biceps femuris?

- Elevation of scapula (e.g., shrugging shoulders) - Inferior rotation of scapula (directing glenoid fossa inferiorly) -Lateral flexion of neck (when scapula fixed)

what is the action of this muscle?

ilium at the anterior superior iliac spine

what is the origin of this muscle?

coracobrachialis

what muscle is highlighted?

skeletal muscle tissue

what type of muscle tissue is this?