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SAT II BIOLOGY > Muscles > Flashcards

Flashcards in Muscles Deck (7)
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1

What are contractions caused by?

The sliding of actin and myosin filaments pas each other within cells

2

Smooth/involuntary muscle

-Walls of blood vessels
-Digestive tract
-Nonstriated
-Connected to each other through junctions that allow electrical impulses to pass
-Under control of the autonomic nervous system

3

How does smooth muscle contract?

In response to action potentials and mediated by actin-myosin fibers

4

Skeletal/Voluntary Muscles

-Striations
-sarcomeres
-somatic nervous system

5

Striations

Alternating light and dark bands caused by overlapping strands of myosin protein filaments that slide past thin actin protein filaments during contraction

6

sacromeres

section of actin and miyosin filaments that form contractile unites within each muscle cell

7

What stimulates skeletal muscle fiber?

-Nerves though neuromuscular synapses
-An action potential moves over the whole muscle fiber,releasing calcium, which causes the actin and myosin to slide over eachother