Epithelial cells that produce secretions are called gland cells. Individual gland cells are scattered with other cells in an epithelium. In a glandular epithelium, most or all of the cells produce secretions and they are discharged as “exocrine”. Exocrine is discharged onto the surface of the epithelium. “Endocrine” secretions are released into the surround tissue fluid and blood.
Some cells have more energy that others, your fat cells have lots more mitochondria because they store a lot of energy. Muscle cells have many mitochondria which allows them to respond quickly when needed. All living cells contain ribosomes, tiny organelles composed of 60% ribosomal RNA and 40% protein. ‘Ribosomes are mainly found bound to the endoplasmic reticulum and the nuclear envelope as well as freely scattered throughout the cytoplasm’ Davidson, Jan,2005. The ribosomes serve as the protein production for the cell, and are
It's also found in the uterus and fallopian tubes. The movement of cilia move the ovum to the uterus. Glandular Epithelium are basically columnar epithelium with goblet cells. Some parts consist of such a large number of goblet cells that there are only a few normal epithelial cells left. They secrete substances
The BBB also known as the Blood Brain Barrier which in conjunction with the Cerebrospinal Fluid or CSF is what nourishes and protects the cells of the CNS. The CSF protects these cells by keeping a clear, colorless barrier around the brain and spinal cord which prevents physical injury as well as chemical. The BBB is a little different however it actually protects the CNS from harmful substances and pathogens by eliminating the transfer of these harmful substances from blood into the interstitial fluid of the brain tissue. (Pages 423- 428) 3. The Cerebrum is located in the upper most part of the brain and divided into left and right hemispheres which are divided again into four different lobes.
Hormones (pp. 520–525; Figs. 15.2–15.4) A. Chemistry of Hormones (p. 520) 1. Hormones are long-distance chemical signals that are secreted by the cells to the extracellular fluid and regulate the metabolic functions of other cells. 2.
3. Return to the main Endocrine System homepage and click on the Pituitary Gland. a. The pituitary produces several hormones that regulate various parts including other endocrine glands. This rather large role earns it the “master gland” nickname.
Approach to Cancer Care Michael Addair R.N. Grand Canyon University NRS-410V Pathophysiology and Nursing Management of Clients' Health January 11, 2015 Approach to Cancer Care The second leading cause of death in the U.S. is cancer. Cancer is the uncontrolled cell growth, which then leads to unregulated cell division and in turn leads to formation of malignant tumors. These malignant tumors then invade near by body parts. Cancer can also invade other parts of the body through the blood stream and lymphatic system.
Dendritic cells ‘present’ antigens to T cells, causing T cells to proliferate into either helper T cells, which aid B cell activation, or cytotoxic T cells, which leave the lymph node via the efferent vessels (Milling n. d.) to areas of antigenic activity in the body. Juxtaposition of B and T cells with dendritic cells is essential for their activation (Mondino et al 1996). The medulla contains B cells, macrophages, and antibody-producing plasma cells which have migrated from the cortex, all embedded within a reticular fibre and cell network. From the medullary sinuses, the filtered lymph drains into one or two efferent lymphatic vessels located at the hilum (depression in the concave side of the ‘bean shape’) (blood vessels also enter and exit the node here). Valves in the efferent vessels direct lymph out of the node, along with antibodies secreted by plasma cells and cytotoxic T cells.
Skin and the Integumentary System A. Skin is composed of 2 main layers 1. Epidermis is made of keratinized stratified squamous epithelial tissue, is superficial to the dermis, and is avascular. 2. Dermis is mainly connective tissue, is deep to the epidermis, and is vascular * The skin contains collagen (for strength) and elastic (for stretch) fibers.
The lymph vessels collect fluid, called lymph from the body tissues and return it to the blood, maintaining the fluid balance within the body. Lymph filters through the lymph nodes, which are packed with white blood cells known as lymphocytes. These are produced in the bone marrow, spleen and thymus, and they help to protect the body against infections. Spleen: This is the largest lymphatic organ. It is located on the left side of the body just above the kidney.