6.4

Question 0

Skeletal muscle is AKA

Answer 0

Voluntary muscle because you have control over when to contract these muscles and bring about movement

Question 1

Skeletal muscle is the muscle tissue attached to the

Answer 1

Bones of your body

Question 2

Another name for skeletal muscle is striated muscle due to its

Answer 2

Striped appearance when you look at it under the microscope

Question 3

The muscle fibre is surrounded by a plasma membrane called the

Answer 3

Sarcolemma

Question 4

The cytoplasm in the muscle fibre is called the

Answer 4

Sarcoplasm

Question 5

The sarcoplasm contains large numbers of

Answer 5

Mitochondria

Question 6

The muscle fibre is not divided up into individual cells but is more like several cells fused together. This means that it has

Answer 6

Several nuclei along its length

Question 7

The muscle fibres appear striped or striate because they are made up of bundles of many smaller

Answer 7

Myofibrils (also striped)

Question 8

Each Myofibril is striped in the same way and they line up together to give a striped appearance

The Myofibrils are made up of many smaller protein filaments called

Answer 8

Myofilaments

Question 9

(ANTAGONISTIC PAIRS) muscles can contract and

Answer 9

Relax

Question 10

(ANTAGONISTIC PAIRS) they can exert a pulling force when they contract but they cannot push. Therefore to bring about movement an antagonistic pair of muscles is

Answer 10

Needed

Question 11

(ANTAGONISTIC PAIRS) an example is biceps and triceps. When the biceps contracts and the triceps relaxes, the arm

Answer 11

Bends at the elbow

Question 12

(ANTAGONISTIC PAIRS) to straighten the arm, the

Answer 12

Biceps relaxes and the triceps contracts

Question 13

(ANTAGONISTIC PAIRS) muscles that bend a limb are called

Answer 13

Flexors

Question 14

(ANTAGONISTIC PAIRS) muscle that straighten a limb are called

Answer 14

Extensors

Question 15

(ANTAGONISTIC PAIRS) several different pairs of antagonistic muscles are involved in controlling

Answer 15

Posture in humans

Question 16

(ANTAGONISTIC PAIRS) contraction of Soleus muscle pulls the heel up and extends the foot, whereas contraction of the tibialis anterior bends the ankle raising the foot.
To stand upright, both muscles need to contract a little so that they both exert a tension. This is called.

Answer 16

Isometric contraction

Question 17

(ANTAGONISTIC PAIRS) to keep the leg straight at the knee, the rectus femoris and biceps femoris also need to show

Answer 17

Isometric contraction

Question 18

(ANTAGONISTIC PAIRS) when the gluteus Maximus and rectus femoris both contract isometrically the trunk is kept

Answer 18

Upright

Question 19

(ANTAGONISTIC PAIRS) only a small number of fibres contract at any time in each of these muscles and the fibres involved change constantly, ensuring that the muscle does not become

Answer 19

Fatigued

Question 20

(SLOW-TWITCH/FAST-TWITCH MUSCLE FIBRES) aerobic exercise, the fibres most active are

Answer 20

Slow-twitch

Question 21

(SLOW-TWITCH/FAST-TWITCH MUSCLE FIBRES) slow twitch five are used for endurance sports and look red in colour because they contain a lot of

Answer 21

Myoglobin

Question 22

(SLOW-TWITCH/FAST-TWITCH MUSCLE FIBRES) myoglobin is a red pigment that stores

Answer 22

Oxygen

Question 23

(SLOW-TWITCH/FAST-TWITCH MUSCLE FIBRES) fast twitch fibres are mainly used in intensive exercise that is carried out for a

Answer 23

Short period of time

Sprinting

Question 24

(SLOW-TWITCH/FAST-TWITCH MUSCLE FIBRES) fast-twitch produce

Most of their ATP by

Answer 24

Anaerobic respiration

Question 25

(SLOW-TWITCH/FAST-TWITCH MUSCLE FIBRES) fast twitch appear whiter in colour as they do not contain

Answer 25

Much myoglobin

Question 26

(SLOW-TWITCH/FAST-TWITCH MUSCLE FIBRES) most of the muscles contain a mixture of slow and fast twitch muscle fibres but there are exceptions

Muscles in back involved in maintaining posture mainly contain:

Muscles that move eyes and the muscle in eyelids are made up of mainly:

Answer 26

Slow twitch

Fast Twitch

Question 27

5 factors of Slow twitch fibres:

Answer 27

Contain large numbers of mitochondria

Produce ATP by aerobic respiration

Supplied by many capillaries

Much smaller diameter than fast-twitch

Contain a large amount of myoglobin

Question 28

5 factors of Fast twitch fibres:

Answer 28

Contain few mitochondria

Produce ATP by anaerobic respiration

Supplied by fewer capillaries

Much larger diameter than slow-twitch fibres

Contain very little myoglobin