Skeletal Muscle Tissue

This is the skeletal muscle tissue shown in the photo at the right and this skeletal muscle plays an important role in the human body and I will discuss these functions.
1. First I will discuss the first the functions as a whole, one it helps to produce movement which is the muscle contraction and help you to respond quickly.
2. Also, they help to maintain posture and this is because they make tiny adjustments which help us maintain our body posture or seated up.
3. These muscles help to maintain the stabilization of joints because the muscles pulling on bones causes movements  and helps to strengthen and stabilize them.
4. Last it helps to generate heat because they contract which helps to maintain normal body temperature and it's the most important muscle type for generating the heat.
Now just for some individual structures of what they are:
Muscle- it consists of hundreds to thousands of muscle cells, plus connective tissue wrappings, blood vessels, and nerve fibers
Fascicle- is a portion of the muscle and is a discrete bundle of muscle cells, segregated from the rest of the muscle by a connective tissue sheath
Muscle fiber- is a elongated multinucleate cell; which has a banded appearance.
Myofibril or fibril- is a rodlike contracile element; they occupy most of the muscle cell volume; bands of adjacent myofibrils are aligned; and composed of sarcomeres arranged end to end.
Sarcomere- it's the contractile unit, composed of myofilaments made up of contractile proteins
Myofilament or filament- there are two types thick and thin the thick contain bundled mysoin molecules; and thin contain actin molecules.

This is an important part of the human body to me because of those top four functions: produce movement, maintain posture, stabilize joints, and help to maintain temperature. To me I would have to say it's extremely important without this there would be no life for us because not having movement would be the worst filling in the world and that's why to me.

EKG Lab

Types of Fractures

Comminuted Fracture- Bone fragments into three or more pieces, particularly common in the aged, whose bones are more brittle.

Compression Fracture- Bone is crushed, is common in porous bones (i.e., osteoporotic bones) subjected to extreme trauma, as in a fall.

Spiral Fracture- Bagged break occurs when excessive twisting forces are applied to a bone, is common sports fracture.

Epiphyseal Fracture- Epiphysis separates from the diaphysis along the epiphyseal plate, and tends to occur where cartilage cells are dying and calcification of the matrix is occurring.

  Depressed Fracture- Broken bone portion is pressed inward, typical of skull fractures.

Greenstick Fracture- Bone breaks incompletely, much in the way a green twig breaks. Only one side of the shaft breaks; the other side bends, is common in children, whose bones have relatively more organic matrix and are more flexible than those of adults.







Now we will discuss some more about these fractures and little of bone repair. It's important to know the type of fracture you have because that why the doctor can give you the proper treatment and that why the bone will heal properly. So that is why it's important to understand and know what type of fracture it's that you have. Now to discuss some treatment, to treat a fracture you must be by reduction or the realignment of the broken bones. There are two types of reduction closed and open, closed is when the bone ends are put into position by the doctor's hands, and in open the bone ends are secured by pins or wires. Then of course everyone knows then it's immobilized by a cast or traction. Then it takes six to eight weeks to heal and that is important to know that way you know how your bones heal and understand what goes into the healing process.

Directional Body Terms

Superior (cranial) Toward the head or end or upper part of a structure or the body; above

Inferior (caudal) Away from the head end or toward the lower part of  a structure or the body; below

Anterior (ventral) Toward or at the front of the body; in front of

Posterior (dorsal) Toward or at the back of the body; behind

Medial- Toward or at the midline of the body; on the inner side of

 Proximal- Closer to the origin of the body part or the point of attachment of a limb to the body trunk

Distal- Farther from the origin of a body part or the point of attachment of a limb to the body trunk

Superficial (external) Toward or at the body surface

Deep (internal) Away from the body surface; more internal

Intermediate- Between a more medial and a more lateral structure

Lateral- Away from the midline of the body; on the outer side of

Why are the Directional Body Terms important to science, I believe this is because it helps to direct where the body parts are on the body and would help to discuss to others doctors which way to cut or where something is located. Another reason why I believe these terms are helpful is just to know the language of Anatomy which I think plays a role of how and why doctors learn how to discuss this. That to me is why these terms even play any role at all in the world and that's why I think it's important in the world of Anatomy.

Organization of the body

This is the process of what builds up to an organism and the final step is the organismic level which is all structural promotions working to maintain life.
1. Chemical Level
    a. atoms (tiny blocks of matter) combine to form molecules (water, protein, etc.) they in turn form organelles ( basic stuff of microscopic cells)

2. Cellular Level
     a. They are made up of molecules and enhance to create tissues.

3. Tissue Level (combination similar cells)
    a. groups of small cells have common fuction
         1. Types
              a. Epitheium ( covers bodies surface and lines cavities)
              b. Muscle ( movement)
              c. Connective Tissue ( supports protects organs)
              d. Nervous Tissue ( rapid communication by electrical impulses)

4. Organ Level ( different types of tissue)
   a. at least two types of tissue and complex functions are possible
   b. have specialized functions
                                    
                                                     5. Organ System Level ( work together for common purpose)
                                                        Ex: Respiratory, Muscular, Nervous, or Digestive systems
                                                    
                                                      6. Organismal Level
                                                       a. all structural promotions working to maintain life
The organization of the body is very important because it builds up from atoms all the way to organs and ends in an organism that way life is possible. The systems are key because without the systems working together their is no life because muscles help up move around our world, the nervous helps us respond to our surrounding and respond to body systems.  Digestion helps us breakdown food and give us energy and nutrients to keep going, Excretion helps us to flush out unnecessary things in the body and how the systems help us to reproduce and grow also. I believe that is why the organization is so important because it helps us in life to keep living.

Tissues

1.    Simple Squamous Epithelium

Characteristics of simple squamous epithelial tissue:

This is a single layer of flattened cells with disc-shaped nuclei and sparse cytoplasm. It allows passage of materials by diffusion and filtration where protection isn’t high priority and It also secretes lubricating substances in serosae.

Examples of simple squamous epithelial tissue:

Some examples are Kidney glomeruli, air sacs of lungs, lining of heart, blood vessels, and lymphatic vessels.

2. Simple Cuboidal Epithelium

Characteristics of simple cuboidal epithelial tissue:

It’s a single layer of cubelike cells with large, spherical central nuclei. The function is secretion and absorption.

Examples of simple cuboidal epithelial tissue:

Examples of this are kidney tubules, ducts and secretory portions of small glands, and ovary surface.

3.    Simple Columnar Epithelium

Characteristics of simple columnar epithelial tissue:

This is a single layer of tall cells with round to oval nuclei, some cells have cilia, and may contain goblet cells. The functions are absorption, secretion of mucus, enzymes and more; and probels mucus by ciliary action.

Examples of simple columnar epithelial tissue:

Examples are nonciliated type lines most of digestive things as stomach to anal canal, gallbladder, and excretory ducts; small bronchi, uterine tubes, and some regions of the uterus.

4. Pseudostratified Columnar Epithelium

Characteristics of pseudostratified columnar epithelial tissue:

It’s a single layer of cells of differing heights, some not high enough for the free surface, nuclei at different levels; and may have goblet cells and bear cilia. The functions are secretion, of mostly mucus and propulsion of mucus by ciliary action.

Examples of pseudostratified columnar epithelial tissue:

Examples are nonciliated type in male’s sperm carrying ducts and ducts of large glands; ciliated variety lines the trachea, most of the upper respiratory tract.

5. Stratified Squamous Epithelium

Characteristics of stratified squamous epithelial tissues:

Thick membrane composed of several cell layers; basal cells (cuboidal or columnar), surface cells (flattened). The surface cells have keratin and dead and the basal produce cells of superficial layers. The functions are to protect underlying tissues in areas subjected to abrasion.

Examples of stratified squamous epithelial tissues:

They are found in nonkeratinized forms: the moist linings of the esophagus, mouth and vagina; and keratinized forms the epidermis of the skin and dry membrane.

6. Stratified Cuboidal Epithelium

Characteristics of stratified cuboidal epithelial tissues:

Usually two layers of cuboidal cells. Rare in the body

Examples of stratified cuboidal epithelial tissues:

They are found in the ducts of large glands (sweat glands, mammary glands)

7. Stratified Columnar Epithelium

Characteristics of stratified columnar epithelial tissue:

It occurs at transition areas or between two types of epithelia, and only its apical layer of cells are columnar. Also rare in the body

Examples of stratified columnar epithelial tissue:

They are found in the pharynx, male urethra, and lining some glandular ducts

8. Transitional Epithelium

Characteristics of transitional epithelial tissues:

It resembles both stratified squamous and cuboidal; basal are cuboidal or columnar and surface are dome shaped or squamouslike. Function is it stretches readily and permits distension of urinary organ by contained urine.

Examples of transitional epithelial tissues:

The examples are it lines the ureters, bladder, and part of the urethra

Homeostasis

The clinical definition for homeostasis is a state of body equilibrium or stable internal environment of the body. That is why we always have a reason for shivering and sweating, this is to maintain a healthy and stable body temperature to keep our body functions going.  Without these basic processes we would probably perish and die from overheating and hypothermia and either look like a toasted turkey or a frozen Popsicle.

 The first way and simple way our body keeps cool is by sweating this is a process were the body begins to remove water from the body and tries to keep us cool. Most people believe that sweating is disgusting, like I do because I have excess sweating but it’s a way to not let us over heat because without it we couldn’t withstand the temperature around us. That’s also the reason people need to stay hydrated by drinking water because of the excess water loss throughout the day.

Now the second simple way to maintain our body heat develops when it’s cold outside that is shivering. Now shiver is so awkward especially if are really cold because you shake uncontrollable trying to warm up and sometimes I can even hear my teeth click together. This is because shivering the contracting and relaxing of your skeletal muscle that produces heat from respiration. This may be a simple process but is very important because it does help you produce some energy to keep on going in case you forgot you coat out in the cold air as I sometimes misplace it. 

Thank god these processes help the body maintain the correct temperature to keep going or else we could not even survive could you just imagine us rolling in mud because we couldn’t sweat like pigs or elephants, I sure couldn’t and am glad we don’t have to, aren’t you.