Muscle Contractions

Thick filaments are made of ________ and thin filaments are made of ____________.

• myosin/actin

• actin/myosin

• calcium/sodium

• sodium/calcium

What is the function of the sarcoplasmic reticulum?

• stores phosphorus

• stores calcium

• stores sodium

• stores potassium

What is the first step to a muscle contraction? 

• The muscle impulse goes down the T Tubules

• The nerve impulse is sent to a motor neuron

• Acetylecholine passes into the synaptic cleft

• Calcium ions diffuse into the sarcoplasm

specialized smooth endoplasmic reticulum that surrounds each myofibril, it stores calcium and releases on demand

• sarcolemma

• sarcoplasmic reticulum

• thick filament

• thin filament

A quick jerky response

• Twitch

• Tetanic

• Isotonic

• Isometric

produces movement in joints, muscle shortens, causing insertion to move towards origin

• Twitch

• Tetanic

• Isotonic

• Isometric

What type of muscle action is this?

• Abduction

• Adduction

• Flexion

• Extension

Answer explanation

AB- AWAY

What type of muscle action is this?

• Abduction

• Adduction

• Flexion

• Extension

Answer explanation

AD- TOWARDS

What type of muscle action is this?

• Abduction

• Adduction

• Flexion

• Extension

Answer explanation

Flexion- makes the angles between 2 bones smaller

What type of muscular action is this?

• Circumduction

• Rotation

• Eversion

• Inversion

Answer explanation

Tags

NGSS.MS-PS2-1