CIRCULATORY SYSTEM 1. INTRODUCTION The circulatory system is also known as the cardiovascular system. This system is a double circulatory closed system which transports blood via arteries, veins and capillaries to the lungs through the pulmonary circulation and to the rest of the body tissues in the systemic circulation. Since the blood travels to varying distances around the body, the blood vessels have to be adapted to overcome different pressures. The pressure changes in the four chambers on the heart (two atria’s and two ventricles) allow the blood to continuously flow in one direction.
• Sensation Sensory stimuli in specialised epithelial cells. • Secretion In glands, epithelial tissue secretes specific chemical substances like as enzymes, hormones and lubricating fluids. • Absorption Certain epithelial cells which are lining the small intestine absorb nutrients from the digestion of food. • Excretion Epithelial tissues in the kidney excrete waste products from the body and reabsorb important materials from the urine. Also sweat is excreted from the body by epithelial cells in the sweat
The bone marrow has the soft tissue located at the center of bone. Next one is the thymus. Thymus is the place where the T lymphocytes matured. There is alos lymphatic vessels qho are parallels with veins and arteries. It allows the cells to pass through.
Examples of structural proteins are cytoskeleton, microtubules, microfilament, collagen, keratin, elastin, actin, and tubulin. Humans need structural proteins to live. The structural proteins in humans create our hair, tendons, fingernails, bones, and the crystalline lens of the eye. Most of the matrix of our body is produce by structural proteins. They can consist of one or a few kinds of subunits.
INTRODUCTION Bone is a living, complex, hard tissue that constitutes the vertebral skeleton. It is a composite comprising of well-defined structures at different scales of hierarchy. It has an organic matrix phase composed primarily of collagen, with the inorganic phase embedded in it. The calcium and phosphate containing inorganic crystals ultimately form hydroxyapatite. The bone morphology can be describes as comprising of the cortical bone - the outer compact region, and the trabecular bone - the inner spongy region.
Actin and myosin are proteins that involved in muscle contraction and movement. Haemoglobin is a protein that transports oxygen through the blood. For protection, there are immunoglobulins. Immunoglobins are glycoprotein molecules that are produced by plasma cells. It functions as antibodies.
There are two types of involuntary muscles- Cardiac (striated) and smooth (visceral). Involuntary muscles also help to maintain posture and control body temperature. The diagram below shows the structure of the musculoskeletal system: The Circulatory System The circulatory system is made up of four major components: The Heart, Veins, Arteries and Blood. Its main purpose is the Heart pumps to carry blood with nutrients and cells throughout the body to the organs. There are two main circulations that happen with in the body they are:
It is nestled between the lungs and the mediastinum. Because of where the heart is located some can feel the heart with the palm of their hands if they apply pressure under the sternum. The heart delivers blood to our entire body. In order for the heart to pump efficiently it contracts and relaxes in intervals to allow the blood to be successfully pumped to all of the cells, organs and tissues. This is called systolic and diastolic pressure.
Each tissue was identified. The results are as follows: • Epithelial Tissue - The epithelial tissue covers majority of the body surface and also makes up the lining of some internal organs. This tissue is responsible for the protection of the body from dust, dirt, bacteria and other organisms that lie outside the body, it may also be changed/modified to glands that produce mucus, hormones, enzymes and etc. , also all epithelial cells are supported by a basement membrane underneath it. - There are 2 different classifications of epithelial tissue, the types of cell (squamous, cuboidal, columnar) and the number of layers (simple- one layer, stratified- two or more layers, pseudo stratified- one layer but it looks like there’s more than one), but there is also one special type of epithelial tissue which is called transitional epithelial tissue.
It is a group of similar cells that have the same functions in human body are known as tissues. Tissues outcomes in the formation of organs made primarily of tissues. The epithelial tissue’s function is to cover and line ultimately all of the body’s cavities and surface. Connective tissue is known to bind, support, and separate other organs and tissues. There are five kinds of connective tissue which are cartilage, bone, blood and loose and dense connective tissue.