muscle work

Question 2

excitability

Answer 2

respond to chemicals released from nerve cells

Question 3

conductivity

Answer 3

ability to propagate electrical signals over a membrane

Question 4

contractility

Answer 4

ability to shorten and generate force

Question 5

what are myofibrils

Answer 5

• make up muscles
• made of actin and myosin
• overlap called sarcomere

Question 6

contractile proteins

Answer 6

• actin
• myosin

Question 7

regulatory proteins

Answer 7

turn contraction on and off
- troponin
- tropomyosin

Question 8

structual proteins

Answer 8

alignment, elasticity and extensibility
- titin
- myomesin
- nebulin
- dystrophin

Question 9

actin filament

Answer 9

• made up of actin, troponin and tropomyosin
• myosin-binding site on each actin molecule covered by tropomyosin in relaxed muscle

Question 10

sliding filament theory

Answer 10

• myosin binds onto thin filaments
• thin filaments slide inwards
• z discs come towards eachother
• sarcomeres shorten, muscle fiber shortens, muscle shortens