Lab 7 Muscles, Reaction Time & Reflexes

Question 1

Sarcomeres

Answer 1

Two types of filaments that make up the muscle cell (actin and myosin)

Question 2

Actin

Answer 2

Thin filament
Similar to fine pearl necklace
Delicate

Question 3

Myosin

Answer 3

Thick filament
Strong
“Power house” of muscle
Heart shaped projection

Question 4

Tropomyosin

Answer 4

Winds itself around actin

Covers up the myosin cross-bridge binding sites

Question 5

Troponin

Answer 5

Bound to tropomyosin

Question 6

Motor neuron

Answer 6

Brain sends neural impulses to the muscle cell via motor neuron

Connects to muscle cells @ transverse tubules

Question 7

Sarcoplasmic Reticulum

Answer 7

Happens when a muscle depolarizes

Releases its stores Ca++

Question 8

Ca+2 ATPase Pump

Answer 8

When a cell is relaxing ATP is used by the “pump” in order to pump Ca++ back into the sarcoplasmic reticulum for storage

Question 9

Motor Unit

Answer 9

Is one motor neuron and all of the muscle cells it goes to

Question 10

Recruitment

Answer 10

A process of increasing the number of motor units that are active in a muscle at any time

Question 11

Summation

Answer 11

Occurs when the time between twitch is not long enough to allow the muscles to completely relax to its baseline level of tension

Question 12

Tetanus

Answer 12

Strongest contraction possible for a muscle

Question 13

Striated muscle

Answer 13

Attached to our bones and allows movement within those bones