1. Support
2. Protection
3. Movement
4. Maintain body temperature
5. Guard orifices - gives contrl over swallowing, defecation, and urination
6. Allows for breathing (diaphram is a skeletal muscle)

Name the muscle sheaths of the skeletal muscle starting at the largest most outer layer and working to a single muscle fiber.

Epimysium to the perimyseum, which wraps the fiscicle, then the endomysium, which wraps the miscle fiber.

What does it mean when someone says a skeletal muscle is excitable?

That the muscle can generate an electrical current call and Action Potential.

What does it mean when someone say a skeletal muscle can show contractability?

It is the ariolar CT wrapped around each muscle cell

It is a groups of muscle cells in the muscle organ that are wrapped by the permysium

It is dense irregular CT that surrounds the muscle organ.

1. They are excitable (can generate electrical current)
2. Show contractility (can generate force, shortening)
3. Have elasticity (can be twisted and hold shape)
4. Have extensibility (Can be stretched)

Muscle organs are all of the different muscles we are learning. The covering is called epimysium

1. Skeletal Muscle
2. Nervous Tissue - Every muscle cell has its own neuron
3. CT Proper - dense irregular connective tissue that makes up the sheath covering muscle organ called epimysium

A group of muscle cells in the muscle organ. This group of cells is surrounded by the perimysium

Describe the muscle organ from the outer sheath to the inner most single muscle cell.

1. Muscle organ is wrapped by dense irregular muslce tissue called epimysium
2. Inside of muscle organ are groups of cells called fasicles. These are wrapped by the perimysium.
3. Inside of the fascible are single muscle cell wrapped in the endomysium.

Sheet like tendon that sometimes attach muscles to bones or to other muscles. (A sheet of pearly-white fibrous tissue that takes the place of a tendon in sheetlike muscles having a wide area of attachment.)

Muscle fiber or myofiber. Any of these mean muscle cell

Roots sarco-, myo-, or mys are always related to what?

The 'cell membrane' of the muscle is called what?

The 'cytoplasm' of the muscle cell is called what?

Where the cell folds in and forms channels across the cell.

It is the hemoglobin of the blood. It binds oxygen in the muscles. This is needed for ATP production.

It is a carbohydrate (a big pollamer of glucose) that provides nutrient

The tubelike structures that fill the inside of the sarcoplasm is called what?

A special smooth sarcoplasmic reticulam (Called SR instead of ER) It has lots of mitochondira to produce energy.

What are three things we will see inside of the muscle fibers?

100's - 1000's myfibrils, Glycogin (stores glucose), myglobin (binds oxygen)

What surrounds the myofibril and what is in the myofibril.

Endomysium sheath surrounds it. Inside is the smooth ER called Sarcoplasmic Reticulum that stores calcium. Also inside is the myofibril are smaller structures called myofiliments.

When looking at one miofibril of the muscle cell there are compartments. What are these called?

What divides one sarcomere compartment from the next?

Z-Disc - a proteing that separtates one compartment from the next.

What are the smaller structures inside the sarcomeres?

Thick myofilaments and thin myofilaments. These create the light and dark lines that create striations in skeletal muscles.

Extend from Z-disc and extend towards middle but they don't reach the middle.

The entire length of thick filaments in the sarcomere

The center of the A-band where is no overlap of thin filaments

Where there is only thin filaments (known as light band)

A protein disk that runs down the center of the 'I-Band'

When a muscle contracts, what happens to the I-Band and the H-Zone?

When a muscle contracts, what happens to the A-Band?