IB SEHS

What is the name of the gap between two neurons?

• Synapse

• Dendrite

• Axon

• Cell body

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

According to the sliding filament theory, which of the following change in length during isotonic muscle contraction?

• I and II only

• I and III only

• II and III only

• I, II and III

Which type of athlete would most likely have the largest proportion of type IIb muscle fibres in the gastrocnemius muscle?

• 1500m runner

• 800m runner

• 400m runner

• 200m runner

Which letter represents amplitude? (a)  

• A

• B

• C

• D

• E

Tags

NGSS.MS-PS4-1

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

Which is a characteristic of a slow twitch (type I) muscle fibre?

• High number of mitochondria

• Low capillary density

• High glycogen stores

• Low resistance to fatigue

Who am I?

Fatigue rate - low

Contraction speed - low

Muscle fibre size - small

Force production - low

• Slow oxidative fibres

• Fast oxidative fibres

• Fast glycolytic

Who am I?

Fatigue rate - low (secs)

Contraction speed - high

Muscle fibre size - large

Force production - high

• Type I

• Type IIa

• Type IIb

Action potentials are electrical signals that tell muscle tissue to contract.

• True

• False