Video 5: POGIL - Sliding Filament Theory Of Muscle Contraction Explained

You will use this video to help with the POGIL.  The POGIL is posted in the Google Classroom and copies are up front.  Do you have the POGIL?

• YES... ready to go

• No... don't need it.

Each muscle is made up of many bundles of ________ which in turn are made up of many __________which are made up of proteins called ___________

• myofibrils; actin and myosin; muscle fibers

• actin and myosin; muscle fibers; myofibrils

• muscle fibers; myofibrils; actin and myosin

• actin and myosin; myofibrils; muscle fibers

The sarcoplasmic reticulum stores

• water

• calcium

• neurotransmitters

• ATP

The sarcomere is a functional contractile unit that contains

• liquid

• myofibrils

• sarcoplasmic reticulum

• actin and myosin

A nerve impulse that arrives at the muscle will release a chemical called

• acetylcholine

• calcium

• actin

• myosin

The nerve impulse causes an impulse to release _____ from the sarcoplasmic reticulum

• calcium

• ATP

• troponin

• tropomyosin

The calcium binds to ______ which causes ______ to move off ________ on actin

• tropomyosin; troponin; active site

• troponin; tropomyosin; active site

• tropomyosin; active site; troponin

• active site; troponin; tropomyosin

A crossbridge is formed when the 

• calcium attaches to the troponin

• calcium attaches to the tropomyosin

• myosin head attaches to the binding site on the actin

• tropomyosin moves off the binding site

The breakdown of ATP causes the _______to create a powerstroke.

• myosin head to pull the actin in toward the middle

• actin to pull the myosin out toward the sides

• myosin head joins with the binding site

• calcium joins the troponin

The addition of ATP allows for 

• myosin head to bind to binding site

• myosin head to pull the actin filament

• myosin head to detach from the binding site