Cellular Biology: Epithelial and Connective Tissues
Epithelial Tissue
Formed by one or more layers of cells attached tightly to each other, epithelial tissue has little or no extracellular matrix. It is avascular, meaning its nutrition depends on the blood supply to neighboring tissue, and it is innervated with nerve endings.
Functions
- Protection
- Absorption
- Excretion
- Filtration
- Drainage
- Sensation
Types
- Lining epithelium
- Glandular epithelium
- Neuroepithelium (which forms the sense organs)
Epithelial Cell Junctions
- Tight junctions (occlusion zones)
- Areas of accession
- Desmosomes
- Interdigitations
- Gap
Dietary Fiber: Types, Benefits, and Food Sources
Crude Fiber vs. Dietary Fiber: What’s the Difference?
Crude fiber is an analytical measurement, an empirical value representing the organic residue that remains after a defatted sample is boiled in dilute sulfuric acid and then in an alkaline solution. It is essentially the washed and dried remains of this process. Dietary fiber, on the other hand, is the undigested fraction that passes through the digestive system. Some dietary fiber is soluble but not digestible, such as pectin.
Understanding Crude
Read MoreHuman Digestive System: Anatomy and Function
Mouth
The mouth is divided into two parts: the oral vestibule, which is the space between the inside of the lips and the outer face of the teeth, and the oral cavity itself, which runs from the teeth internally to the entrance of the pharynx. The roof of the mouth is formed by the hard palate and soft palate, which is composed of muscle and covered by mucosa. In the midline of the soft palate, a small mass called the uvula projects downward. The mouth communicates with the pharynx through the fauces,
Read MoreCharacteristics and Pathogenicity of Bacterial Species
Gram-Positive Spore-Forming Bacillus
Gram-positive spore-forming Bacillus are aerobic, used for biological warfare. B. anthracis causes anthrax, and B. cereus causes food poisoning or intoxication.
Bacillus anthracis
Causes skin infections (malignant pustule), papules, vesicles, pustules, necrotic ulcers, and septicemia.
Bacillus cereus
Mobile, forms a swarming unlike B. anthracis. Causes food poisoning in two ways: related to fried rice (emetic) and with meats and sauces (diarrhea). It can also cause
Read MorePreventing Birth Defects: Understanding Teratogenic Factors
Preventing Birth Defects: Understanding Teratogenic Factors
Source: INTERPSIQUIS. 2004
Author: Iris. M. Motta, BA in Psychology
Professor JTP, Universidad Argentina John F. Kennedy
Secretary of Neuropsychology Postgraduate Course in Dynamics of the University Kennedy
Company Secretary of Biopsychopedagogy, Argentina
Email: imotta@fibertel.com.ar
Keywords: Teratogenic Factors, Prevention, Defects in the Developing Embryo
Summary
The biopsychosocial health of a person rests largely on proper embryonic and
Essential Nutrients and Human Digestive, Respiratory Systems
Essential Nutrients and Human Body Function
Food products are natural or processed substances that provide what our cells need to live.
Inorganic Substances
- Water: It is the most abundant compound in living organisms and the environment in which life develops from cells.
- Mineral salts: These are found in bones and teeth. They are also all salts dissolved in body fluids.
Organic Substances
- Carbohydrates: The simplest, such as glucose and maltose, can taste sweet and are known as sugars. Glucose is a sugar