Connective Tissue Coverings
Skeletal Muscle Fiber Structure
The Sarcomere
Energy Metabolism
What Type of Muscle Tissue am I?
Excitation-Contraction Coupling
Muscle Fatigue
Muscle movement and interactions
100

This CT layer covers each individual muscle fiber.

Endomysium

100

This is the name for the cytoplasm of a muscle fiber.

Sarcoplasm

100

The sarcomere is the repeating functional unit of skeletal muscle contraction. It is composed of thick and thin filaments made of these 2 proteins.

Thin filament = actin

Thick filament = myosin

100

The energy currency of the cell

ATP

100

I have multiple nuclei, striations, and a long cylindrical shape.  I function to produce voluntary movement, produce heat, and protect organs.

Skeletal Muscle

100

This is the fluid filled gap between the axon terminal of a motor neuron, and the muscle fiber it innervates. Neurotransmitters are released in this space.

NMJ

100

Build up of this waste product from anaerobic respiration is the primary cause of muscle fatigue.

Lactic acid

100

This prefix refers to flesh.

sarco

200

This CT layer covers each individual muscle 

Epimysium

200

This fiber-like organelle is made up of repeating subunits of myosin and actin.

Myofibril

200

This portion of the sarcomere is where thick and thin filaments overlap, and is also called the "dark band" 

A Band

200

Sally is running a 10 mile race.This is the most likely pathway her muscles are using for ATP regeneration.

Aerobic respiration

200

I am uninucleate, have striations, and intercalated discs. I function to pump blood through blood vessels.

Cardiac Muscle

200

This is the neurotransmitter that stimulates muscle contraction.

Acetylcholine

200

This term describes the amount of oxygen needed to restore ATP levels back to normal, eliminate lactic acid waste, and restore tissue level oxygen back to normal after intense anaerobic exercise.

Oxygen Recovery uptake 

200

These are arranged so as to give skeletal muscle its striations.

Myofilaments

300

This is a broad tendon-like sheet of CT that attaches skeletal muscle to muscle, bone, or other tissue like skin.

Aponeurosis

300

This organelle stores and releases the calcium ions involved in muscle contraction.

Sarcoplasmic reticulum

300

One sarcomere extends from ________________ to ________________, or the points where actin filaments anchor.

Z disc

300

Where does aerobic respiration take place in the muscle cell?

Mitochondria

300

I am the muscle tissue shown here

Smooth Muscle

300

_______ is released from the sarcoplasmic reticulum floods the muscle fiber and binds to troponin in order to expose the active sites on actin filaments.



Calcium

300

The contraction of some muscle fibers in a relaxed muscle.

Muscle tone

300

The contractile unit of a muscle cell.

Sarcomere

400

This CT layer covers each fascicle.

Perimysium

400

This specialized structure controls what enters and exists the muscle fiber. It is similar to a plasma membrane.

Sarcolemma

400

Which number represents the I band?

7 - The light band where there are only thin actin filaments.

400

This molecule that is abundant in muscle tissue can donate a high energy phosphate to ADP in order to generate ATP during brief, but powerful activities.

Creatine phosphate

400

Muscle that is found in hollow organs, blood vessels.

Smooth

400

This temporary structure is formed between myosin heads and actin. It is the formation of this structure, and the power stroke of myosin, that causes sarcomere shortening (AKA contraction).

Sliding filament theory 

400

This occurs when a body stiffens and becomes unmoveable after death. It can last up to 72 hours.

Rigor Mortis

400

Skeletal muscles must connect to at least 2 points. These bones are called the ___ and ____.

Origin and Insertion

500

This connects muscles to bone.

Tendon

500

What is the level of organization of muscle from largest to smallest.

Muscle - Fascicles - Muscle fibers or cells - Myofibrils - Myofilaments

500

When a muscle fiber contracts the sarcomere does this as thin filaments are pulled over  thick filaments within the structure.

Shortens

500

This type of respiration produces lactic acid as a byproduct.

Anaerobic respiration

500

I am the muscle tissue seen here.

Cardiac muscle

500

This travels down the motor neuron until the synaptic cleft is reached. 

Action potential

500

Delayed relaxation of skeletal muscles following a voluntary contraction

Myotonia

500

The state of having one contraction follow another contraction without returning to a fully relaxed state.

Tetanus