IB Biology Topic B3.3 Muscle and Motility…

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IB Biology Topic B3.3 Muscle and Motility… | RevisionDojo

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HLPaper 1AStandard

Sarcomere Region	Resting Length (μm)	Contracted Length (μm)
A-band	1.8

Question 2HLPaper 1A

Refer carefully to the specific arrangement and position of the biceps and triceps in the image. Which change would be observed in the diagram if the forearm \dots

Question 3HLPaper 1A

Calcium binding to troponin normally shifts tropomyosin away from myosin-binding sites on actin. A mutation produces troponin that cannot bind calcium. Motor neuron impulses, calcium release and ATP supply are normal. \dots

HLPaper 1AStandard

The table shows events occurring during the contraction of a skeletal muscle fibre.

	Process	Immediate cause
I	Power stroke	ATP binding to the myosin head
II	Myosin detachment	Tropomyosin moving to cover the actin filament
III	Exposure of binding sites	Calcium ions binding to troponin
IV	Myosin head re-cocking	Release of ADP and inorganic phosphate

Which row correctly matches a process with its immediate cause?

IB Biology Topic B3.3: Muscle and Motility Questionbank