SES Yr 2 A5 Nervous system responses

What is a motor unit?

• The larger the strength required the more motor units recruited

• When all the muscle fibres in a unit contract or non of them

• A nerve and the muscle fibres it stimulates

• The area of the heart which initiates the heart beat

What is the all or none law?

• The larger the strength required the more motor units recruited

• When all the muscle fibres in a unit contract or non of them

• A nerve and the muscle fibres it stimulates

• The area of the heart which initiates the heart beat

What is the size principle?

• The larger the strength required the more motor units recruited

• When all the muscle fibres in a unit contract or non of them

• A nerve and the muscle fibres it stimulates

• The area of the heart which initiates the heart beat

During a long distance run, which type of motor units are most suited to this type of activity?

• Type 1a

• Type 2a

• Type 2x

• Type 3

During a 1 rep max deadlift, which type of motor units are most suited to this type of activity?

• Type 1a

• Type 2a

• Type 2x

• Type 3

Which type of muscle fibre is able to generate the most power, is able to contract quickly but tires quickly?

• Type 1a

• Type 2a

• Type 2x

• Type 3

Which type of muscle fibre is able to last a long duration of time without tiring, contain high levels of myoglobin but do not generate as much power?

• Type 1a

• Type 2a

• Type 2x

• Type 3

The point where a nerve meets the muscle is known as?

• Motor unit plate

• Nerve ending

• Motor end plate

• Neuromuscular junction

Which of the following activities would require the recruitment of the highest number of motor units?

• 20 kg deadlift

• 40 kg deadlift

• 60 kg deadlift

• 80 kg deadlift

What is the name of the neurotransmitter that is released when the nerve impulse meets the muscle?

• Calcium

• Adrenaline

• Noradrenaline

• Acetylcholine