Muscle Histo

Where is smooth muscle

Walls of hollow organs

Which muscle type is multinucleated?

skeletal muscle

What happens at the sarcoplasmic reticulum?

Site of calcium sequestration

What is in the presynaptic neuron?

Ach

What is in the synaptic cleft?

Acetylcholinesterase (AChe)

What is in the subneural clefts?

Ach gated channels at tops, voltage gated Na+ channel in bottom half

What is released during contraction?

Ca2+

Which is thick and which is thin between actin and myosin?

Actin is thin, myosin is thick

What do sarcomeres span from?

Z-line to Z-line

What is a Z-line?

Junction between sarcomeres and anchor site for actin

What does tropomyosin cover?

Covers myosin binding site

What is troponin?

Ca+2 binding site

What happens when Calcium binds?

conformation changes and moves troponin, opening up the actin-myosin binding site

What is the contraction equation?

Calcium+ATP=Contraction

What is preload?

Tension on muscle before contraction

What is afterload?

Tension on muscle after contraction

What is passive tension?

Tension of muscle at rest

What is active tension?

Tension force created by muscle contraction

What is the equation for total tension/

Active tension+passive tension

Is type I myofiber slow or fast twitch?

Slow twitch

Is type II myofiber slow or fast twitch?

Fast twitch

What are purkinje fibers?

Electrical conduction system for heart

What flows into smooth muscle to generate the action potential?

Calcium