Unit 10

Skeletal muscles, exert force on tendons, which in turn pull on bones or other structures resulting in

Movement

Which is considered a regulatory muscle protein

Tropomyosin and Troponin

A typical striatedmuscle fiber contains ____ sacromeres

Thousands of

Skeletal muscle contains ______ While smooth muscle does not

Sacromeres

Which description best fits the structure of skeletal muscle cells

Multi-nucleated, striated

Skeletal muscle is ______ While cardiac and smooth muscle are not

Voluntary

The structure labeled 1 is

Tendon

What is the name of the plasma membrane (lips bilayer) Covering the muscle cell

Sacrolemma

Transverse tubules (T tubules) Are bordered on each side by

Sacroplasmic reticulum

Which structure is described as connective tissue forming broad. Flat sheets, allowing muscles to attach across wide bones or other muscles

Aponeurosis

a triad that surrounds a myofibril consist of which structures, in correct order

Sacroplasmic reticulum, transverse tubule, and Sacroplasmic reticulum

Which of the following is described as a strong, thick sheet of connective tissue that covers an entire muscle

Epimysium

The structure labeled “2” is

Epimysium

What is the structure marked “4”

Thin filament

Thin filaments attached at an area of the Sacromere called

A band

I’m muscle fiber (cell) Contains numerous _____ within the sacroplasm

Myofibrils

Actin and myosin filament in the skeletal muscle myofibril Are

Parallel

• The structure marked at 5

Thick filament

A motor unit is

A motor neuron, and all of them are muscle Cells it innervates

The synapse between a somatic motor neuron and a skeletal muscle fiber is the

Neuromuscular junction

Which step is shown at “6”

Sacroplasmic reticulum recaptures Ca2+

When muscle contraction occurs

Sacromeres shorten

Which structure releases the calcium needed for muscle contraction to occur

Sacroplasmic reticulum

In the power stroke phase of the sliding filament model, when a muscle contracts….

Thin filaments move towards the M line, moving to the Z discs closer together

These two proteins regulate the interaction of Actin and myosin, depending on whether calcium is present or not

troponin and tropomyosin

When calcium is absent, then the myosin binding site on Actin is

Covered by tropomyosin

Which step is shown at 1

ACh released, binding to receptors

Muscle fatigue may result from

Decreased ATP

Which of the following mechanisms provides ATP for muscle contractions?

Aerobic, oxidation of glucose

Which type of muscle would you expect to have the most mitochondria, Based on the name?

Slow oxidative

The extraocular muscles fire in short bursts and contract very strongly. However, they are not used for long periods of time. However we expect that they are of which type

Fast glycolytic

The ______ Of the biceps brachii is at the scapula, which is the stationary, proximal bone, against which of the arm flexes

Origin

The attachment of a muscle to a stationary bone is called its

Origin

The quadriceps muscle group is named this because it has _____ origins (heads)

4

The tibialis anterior is ____ to the ____

anterior to the tibia

The muscle shown at 1 is the

Wrist flexors

Which of the following muscles has the primary action of shoulder abduction?

Deltoid

The muscle shown at 1 is the

1. Serratus anterior

The muscle shown at 3 is the

1. Teres minor

The muscle shown at 1 is the

1. Subscapularis

The muscle shown here are the

Quadriceps groups

The muscle shown at 1 is the

Gluteus maximus

The muscle at 1 is

Soleus

The muscle shown at one and two have one name (3”)

Illiopsoas

The muscle shown at 1 is the

Hip adductor group

The muscle shown at 1 is the

1. Trapezius

The insertion of the sternocleidomastoid is the

Temporal bone

The insertion of the trapezius is the

Clavicle and scapula

The muscles shown at “1” Are the

• Intercostal muscles