edexcel Sliding Filament Theory

Presentation

•

Biology

•

12th Grade

•

Practice Problem

•

Medium

Jessica Buxton

Used 1+ times

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1 Slide • 15 Questions

SFT

There are 4 main stages to muscle contraction
1. Detachment
2. Hydrolysis
3. Cross Bridge
4. Power Stroke

Multiple Choice

What does the sliding filament theory explain?

How muscles contract at the molecular level

How muscles grow in size

How muscles generate heat

How muscles store energy

Multiple Choice

Thick filaments within a myofibril are:

ATPase

Sarcoplasmic reticulum

Actin

Myosin

Multiple Choice

Thin filaments in a myofibril are

Sarcomeres

Sarcoplasm

Actin

Myosin

Multiple Choice

The energy needed to perform a muscle contraction comes directly from

ATP

Oxygen

Glucose

Calcium

Multiple Choice

The neurotransmitter stored in the axon terminal identified as #3

Calcium Ion (Ca²⁺)

Protein Channel

Acetylcholine

Synaptic Cleft

Multiple Choice

The gap between a neuron and a muscle cell: (#4 in the diagram)

synaptic cleft (synapse)

sarcolemma

vesicle

Ca²⁺ion

Multiple Choice

The plasma membrane of a skeletal muscle cell is called the:

sarcomere

myofilament

sarcolemma

sarcoplasm

Multiple Choice

What state is the sarcomere in #1

Relaxed

Contracting

Fully Contracted

None of the above

Multiple Choice

What state is the sarcomere in #2

Relaxed

Contracting

Fully Contracted

None of the above

Fill in the Blanks

During Action Potential an influx of calcium ions are produce which then bind with

Type answer...

Multiple Choice

What are the repeating units called in myofibrils?

Muscle fibers

Sarcomeres

Cylindrical structures

Myofibrils

Fill in the Blanks

The myosin heads bind to the exposed myosin-binding sites on

, causing the actin filaments to slide over the myosin filaments in a power stroke.

Fill in the Blanks

ATP is required for the myosin heads to detach from actin, and myosin hydrolyzes ATP to ADP and Pi to return to its

position.

Multiple Choice

What triggers the release of calcium ions in muscle contraction?

Action potential

Troponin

Tropomyosin

Myosin-binding sites

Fill in the Blanks

The cross-bridge cycle repeats as long as

ions are available, resulting in the shortening of the sarcomere and muscle contraction.

SFT

There are 4 main stages to muscle contraction
1. Detachment
2. Hydrolysis
3. Cross Bridge
4. Power Stroke

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