cardiac muscle

Found where

• ONLY in heart

Contains

• myofibrils

• Sarcomere

  which enable contraction & cremate striatations (stripes)

The cardiac muscles are involuntary or voluntary?

involuntary

Made up of specialized cells called?

Cardiomyoctes

Structure:

Contains single nucleus

Shape:

Cylindrical

Composed of

Striated cells

(Joined end to end)

Many filaments of? Rely on?

Actin and myosin

striated (striped)

cardiac muscles contains organized units called sarcomere that give striped appearance under a microscope

Cardiomycytes are surrounded by?

• membrane that contains salt ions

• Allows for them to generate an electrical signal called action potentials

Cardiac muscle fibers do not have?

Cross-bands

Cardiac muscle length

Short

Intercalated Disc

Specialized junctions that connect individuals cells to pump blood out of the heat

Gap junctions:

Located within the intercalated disc

Allows electrical signals to pass instantly between cells

Desmososomes

Act like “glue” within the intercalated disc to hold cells together

Cardiac muscles are packed with

• (Mitochondria) produces constant energy (ATP)

What type of cells do the cardiac muscles have?

Branched cells

Endomysium

• Surrounds the cardiac muscle cells

• Connective tissue layer

Endo + mysium

Endo= within

Mysium= muscle

Within muscle= Endomysium

Cardiac muscle contracts one an?

• involuntary basis

• Via the autonomic nervous system