Resistance exercise 1 2.0

Question 1

What is resistance exercise?

Answer 1

Any exercise that causes the muscle to contract against an external resistance with the primary aim of improving muscle strength

Question 1

Three types of resistance exercise?

Answer 1

Concentric, eccentric, isometric

Question 2

How do concentric exercises work?

Answer 2

They shorten the muscle

Question 3

How do eccentric exercises work?

Answer 3

They lengthen the muscle

Question 4

How do isometric exercises work?

Answer 4

They generate force without changing the length of the muscle

Question 5

Issue with definition of resistance exercise?

Answer 5

“external resistance” is a relative term

Question 6

What is strength?

Answer 6

Capacity to exert force under a set of biomechanical conditions

Question 7

What is the short term effect of resistance training?

Answer 7

negative

Question 8

Actual short term effects of resistance training?

Answer 8

Fatiguing, damaging

Question 9

What is supercompensation?

Answer 9

An increase in capacity after a recovery from a resistance exercise

Question 10

What is involution?

Answer 10

The returning to original capacity after a supercomposition if nothing is done to maintain it

Question 11

What makes a muscle stronger?

Answer 11

size

Question 12

What attaches a muscle to a bone?

Answer 12

A tendon

Question 13

Name for a bundle of muscle fibres?

Answer 13

Fasiculus

Question 14

How many myofibrils in a single muscle fibre?

Answer 14

roughly 2000

Question 15

What makes up muscle fasicles?

Answer 15

Muscle fibres

Question 16

How many myonuclei per muscle fibre?

Answer 16

200-300

Question 17

What connects myosin to Z lines?

Answer 17

titin

Question 18

Step 1 of muscle contraction?

Answer 18

AP arrives at neuromuscular junction

Question 19

What happens after AP arrives at neuromuscular junction?

Answer 19

ACh is released

Question 20

What happens as a result of ACh release in muscle?

Answer 20

Depolarization as a result of binding to receptors in myocyte membrane

Question 21

What happens as a result of depolarisation?

Answer 21

Ca2+ is released inside the cell from the sarcoplasmic reticulum

Question 22

What does Ca2+ bind to after being released?

Answer 22

Troponin

Question 23

What happens as a result of Ca2+ binding to tropinin?

Answer 23

Troponin changes shape

Question 24

What happens as a result of troponin changing shape?

Answer 24

Tropomyosin is moved from the active site of the actin filament

Question 25

What happens after tropomyosin has moved from the actin filament's active site?

Answer 25

Myosin attaches to actin, forming a cross bridge at a binding site?

Question 26

What happens as a result of myosin forming a cross bridge?

Answer 26

ATP attached to the myosin head it broken down to release energy for a power stroke of the myosin filament

Question 27

What happens as a result of a power stroke?

Answer 27

Z lines move together

Question 28

What does it mean if Z lines have moved together?

Answer 28

Sarcomere length is reduced--> contracting

Question 29

What happens after the Z lines have moved closer together?

Answer 29

A new ATP molecule binds to the myosin head