Big batty Muscles

Question 1

Describe smooth muscle

Answer 1

• contracts without conscious control
• found: walls of internal organs (not heart)

Question 2

Describe cardiac muscle

Answer 2

• contracts without conscious control
• only found in heart

Question 3

Describe skeletal muscle

Answer 3

• skeletal muscle type used in locomotion (movement)
• eg; biceps and triceps move the lower arm

Question 4

define the term antagonistic pairs

Answer 4

when one muscle group contracts (agonist) the other muscle group relaxes (antagonist)

Question 5

describe the sliding filament theory

Answer 5

• Ca2+ ions released from sarcoplasmic reticulum into sarcoplasm
• Ca2+ diffuse & bind to troponin changing tertiary structure cause tropomyosin to move exposing myosin head binding sites on actin filament
• myosin head bind to actin binding sites forming cross bridges
• mysosin head “nods” pulling actin filament short distance (power stroke)
• ADP+Pi released from myosin head
• new ATP bind to myosin head, breaks cross bridge seperates from actin, action of ATP hydrolase, energy released recocks myosin head