Muscle's Quiz #2

What is the 3 types of Muscle tissue

skeletal, Cardiac, and Smooth

Where is Skeletal Muscle Located

Attached to bones

What is the shape of Skeletal Muscle Cells

Elongated

How many Nuclei do Skeletal Muscle Cells have

Multinucleated

does skeletal muscle have striations and is it involuntary or voluntary control?

Yes, striated and voluntary control

Where is Cardiac Muscle Located

Heart wall (myocardium)

What is the Cell shaped of Cardiac Muscle

Elongated, arms/branches, with intercalated Discs

How many Nuclei Does Cardiac muscle have

2

does Cardiac Muscle have striations and is it involuntary or voluntary control?

Yes, striations, involuntary control

where is Smooth Muscle Located?

walls of hollow organs (stomach, intestines, blood vessels)

What is the Cell Shape of Smooth Muscle

Cell oblong and tapered ends

does Smooth muscle have striations and is it involuntary or voluntary control?

lack striations, and involuntary

Does smooth muscle have nuclei?

Single nucleus

what is a muscle

Entire organ made of bundles of fascicles.

what is fascicle

A bundle of muscle fibers (cells).

What is a muscle Fiber 

muscle cell, multinucleated cell 

where is Epimysium located

Outer layer covering the whole muscle.

Perimysium

Wraps around each fascicle.

Endomysium

Surrounds each individual muscle fiber.

Myofibrils

Long contractile organelles inside fibers.

Myofilaments

Thin (actin) and thick (myosin) filaments that slide for contraction

Sarcomere

Functional contractile unit, between Z-discs.

what are the proteins and function in Contractile

Actin (thin, pulls), Myosin (thick, motor protein with heads that attach to actin)

what are the 2 proteins in Regulatory

Troponin (binds Ca²⁺, moves tropomyosin) and Tropomyosin (blocks actin binding sites)

What are the 2 proteins in Structural

Titin (elasticity), Dystrophin (links myofibrils to sarcolemma).

What is the main element for contraction

Calcium (Ca²⁺)

Major neurotransmitter in skeletal muscle

Acetylcholine

What are the 4 rotator cuff Muscles

Supraspinatus, Infraspinatus, Teres Minor, Subscapularis SITS

What are the 3 intramuscular injection sites

Deltoid, Gluteus Medius, and Vastus lateralis

What is the Cardiovascular system composed of

Heart + blood vessels (pumps & transports blood).

What is the Circulatory system composed of

Includes cardiovascular + lymphatic systems (blood & lymph transport).

What is the 4 functions of the heart

• Pumps blood

• Maintains blood pressure

• Delivers oxygen/nutrients, removes waste

• Maintains systemic and pulmonary circulation

Pulmonary Circuit composed of

Right heart → lungs → left heart (oxygenates blood).

Systemic circuit composed of

Left heart → body tissues → right heart (delivers oxygen).

Pericardium Fibrous is the 

outer, tough connective tissue

Pericardium Serous is the 

parietal & visceral layers with pericardial fluid

Epicardium is the?

Outer

Myocardium is the?

Muscle layer, thickest

Endocardium lines?

inner, lines chambers

Striated is composed of 

branched, single nucleus, involuntary.

Intercalated discs are composed of 

Contains gap junctions and desmosomes → coordinate contraction.

Ventricles are

Larger/thicker than atria (pump blood out.)

Left Ventricles is

most muscular (pumps to whole body)

Right AV (Tricuspid) goes from

RA → RV

Left AV (Bicuspid/Mitral) goes from

LA → LV

Pulmonary semilunar

RV → Pulmonary artery

Aortic semilunar

LV → Aorta

Chordae tendineae & papillary muscles

Prevent AV valves from prolapsing.

Semilunar valves (pulmonary, aortic)

look like “half-moons.”

General function of all valves

Ensure one-way blood flow.