Ch. 3 - Muscle Tissue

Question 1

Muscle Tissue (general traits)

Answer 1

1. contractile - shiver (contract)
2. elastic
3. extensible - back to original state
4. excitable - tied to nerves

Question 2

Muscle Tissue (types)

Answer 2

Skeletal, Cardiac, Smooth

Question 3

Skeletal Muscle Tissue

Answer 3

• large cylindrical fibers (muscle fiber=muscle cell *long cells)
• DO NOT BRANCH
• multinucleated
• striated (stripe like visual feature due to compact fibers)
• voluntary (movement of skeleton/opening of digestive or urinary tracts)
• skeletal muscle fibers are incapable of dividing, but satellite cells repair and make new fibers(stem/mesenchymal cells)
  functions: moves or stabilizes the position of the skeleton, guards entrances and exits to the digestive, respiratory, and urinary tracts, generates heat, protects internal organs

Question 4

Cardiac Muscle Tissue

Answer 4

• heart
• unicellular BRANCHED cardiocytes (smaller than a skeletal muscle fiber)
• uninucleate
• cardiocytes form extensive connections with one another, and these connections occur at intercalated discs
• striated
• involuntary (produces heart beat)
• once cardiac muscles are damaged, they do not regenerate because they lack satellite cells
  function: circulates blood, maintains blood pressure