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need simple definitions. thanks standing complex top staurative aeading rtive ar

ID: 148575 • Letter: N

Question

need simple definitions. thanks

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Explanation / Answer

Areolar connective tissue, has many functions including support and binding, retaining fluids, defense (through its white blood cells), and storing nutrients (fat). This tissue contains most of the cell types listed above, with the exception of chondroblasts and osteoblasts. Areolar connective tissue is the most wide-spread connective tissue, found beneath the skin (hypodermis), and surrounding organs, blood vessels, and nerves.

Adipose tissue contains abundant tightly-packed adipocytes, with little matrix. Functions include energy storage, protection, insulation, and support. Adipose tissue is found in the hypodermis, around organs (heart, kidney, eyeball), and in the abdomen and mammary glands. Both areolar and adipose tissue are well vascularized.

Reticular connective tissue contains reticular fibers and forms the framework of lymphoid organs, such as the spleen and lymph nodes.

Dense regular connectivetissue is composed of tightly-packed bundles of collagen fibers running in a single direction and which exhibit great strength in this one direction. Locations include tendons, ligaments, aponeuroses, and fascia. Dense regular connective tissue is poorly vascularized (and thus heals slowly).

Dense irregular connective tissue contains thick bundles of collagen running in many directions. It is located in the dermis of the skin, and as capsules around organs, nerves, muscles, and bones.

Elastic connective tissue, with its large amounts of elastic fibers, can be found in elastic arteries (aorta) and in a few ligaments.

Hyaline cartilageis the most abundant cartilage in the body, located at the ends of bones (articular cartilage), immature bones (epiphyseal plate), in the nose, between the ribs and sternum, in the trachea, and in most of the fetal skeleton.

Elastic cartilageprovides strength and flexibility, and is found in the outer ear and epiglottis.

Fibro cartilage contains thick bundles of collagen and is more compressible than the other two types of cartilage. It is found in the intervertebral discs, the pubic symphysis, and the menisci of the knee.

Blood is classified as connective tissue since it develops from mesenchymal tissue and contains widely scattered cells (blood cells) surrounded by the matrix ( plasma ).

Boneor osseous tissue provides support and protection. Like cartilage, bone contains a solid matrix with lacunae where the mature bone cells ( osteocytes ) are located. Bone matrix is laid down in concentric rings ( lamellae ), forming osteons , the structural units of bone. Unlike cartilage, bone is well- vascularized.

Skeletal: attaches to and move the bony skeleton – striated – voluntary nervous control.

Cardiac: occurs only in the heart, where it contracts to pump blood though the heart and into the blood vessels – striated – involuntary nervous control.

Smooth muscle (visceral): found in the walls of internal organs, blood vessels, respiratory passages, etc. – smooth (non-striated) – involuntary nervous control.

A neuron is a cell that carries electrical impulses. Neurons are the basic units of the nervous system and its most important part is the brain.