IB SEHS 4.1 Neuromuscular

Front

In the diagram of a motor unit, what is represented by the part labelled X? Options: Axon, Neuromuscular synapse, Nucleus, Dendrite

Back

Dendrite

Front

What is the name of the gap between two neurons?

Back

Synapse

Front

What part of the motor unit is responsible for carrying an impulse towards the cell body? Options: Axon, Dendrite, Motor end plate, Synapse

Back

Dendrite

Front

Which of the following are parts of a motor unit? Dendrite, cell body, nucleus and axon, Dendrite, cell body, tendon and muscle, Dendrite, cell body, cartilage and axon, Dendrite, cell body, ligament and muscle

Back

Dendrite, cell body, nucleus and axon

Front

What is the neurotransmitter involved in stimulating muscle contraction?

Back

Acetylcholine

Front

Which of the following statements is true about the sliding filament theory? During contraction the H zone remains the same length, A cross-bridge is formed by troponin and tropomysin attaching to one another, A nerve impulse causes an action potential to spread across the muscle, ATP is released around the filaments, stimulating the muscle to contract

Back

A nerve impulse causes an action potential to spread across the muscle

Front

According to the sliding filament theory, which of the following change in length during isotonic muscle contraction? I. A band II. H Zone III. Sarcomere

Back

H Zone and Sarcomere

Front

Which type of athlete would most likely have the largest proportion of type IIb muscle fibres in the gastrocnemius muscle? Options: 1500m runner, 800m runner, 400m runner, 200m runner

Back

200m runner

Front

Which of the following outline the properties of a slow twitch (type I) muscle fibre? Myoglobin content - High, Anaerobic capacity - low; Myoglobin content - High, Anaerobic capacity - high; Myoglobin content - Low, Anaerobic capacity - high; Myoglobin content - Low, Anaerobic capacity - low

Back

Myoglobin content - High, Anaerobic capacity - low

Front

Which is a characteristic of a slow twitch (type I) muscle fibre? Options: High number of mitochondria, Low capillary density, High glycogen stores, Low resistance to fatigue

Back

High number of mitochondria