Levels of Organization in Living Things
Levels of Organization
Introduction
Living matter exhibits various degrees of complexity in its structure, ranging from the subatomic level to the biosphere. These levels of organization are crucial for understanding the intricate relationships and functions within living organisms.
Levels of Organization
Subatomic Level
The fundamental building blocks of matter, including protons, neutrons, and electrons, constitute the subatomic level.
Atomic Level
Atoms, composed of subatomic particles, represent the
Read MoreFood Safety and Hygiene Guide
FOOD SAFETY AND HYGIENE
Owners/Managers are responsible for ensuring staff are supervised and trained in food hygiene.
Foodborne Illness
Foodborne illnesses are infectious or toxic diseases caused by agents that enter the body through food ingestion. Symptoms, such as vomiting, fever, diarrhea, and stomachaches, are usually noticed a few hours later.
Causes of Unsafe Food
- Time-temperature abuse: Improper holding temperatures allow bacteria to grow.
- Cross-contamination: Mixing raw and cooked food can transfer
Human Digestive System: Anatomy, Function, and Diseases
Human Body Systems: Nutrition and Waste Elimination
The human body relies on several interconnected systems to obtain nutrients and eliminate waste products. These systems include:
Digestive System
The digestive system transforms food into nutrients that are absorbed into the bloodstream. It consists of the digestive tract and accessory glands.
Digestive Tract
The digestive tract is an 8-meter long tube starting at the mouth and ending at the anus. It includes the following parts:
- Oral cavity (mouth)
- Pharynx
- Oesophagus
- Stomach
- Small
Animal Respiration and Excretion: A Comprehensive Guide
Use of Energy in Living Things
All living organisms utilize the energy obtained from cellular catabolism to carry out essential life processes. This energy fuels reactions necessary for growth, anabolism, and the repair of structures. Animals, for instance, use this energy for:
- Performing mechanical work, such as muscle contraction and nerve impulse transmission
- Transporting substances within the body
- Regulating body temperature
Plants, on the other hand, use energy for:
- Incorporating nutrients from the
Biomolecules: The Building Blocks of Life
Bio elements: C, N, O, H
Fundamental unit of life: cell
Biomolecules: lipids
Nucleic acids: C, H, O, N, P
Peptidic bond: it is established between the amino group (-NH2) and carboxy group (-COOH) of two amino acids.
Polysaccharide: many sugar molecules linked together
Nucleotide: the basic building block of nucleic acids (RNA and DNA).
Wax: a type of long chain non-polar lipid.
Protein: proteins are the building materials for the body.
Cell: basic unit of life
| Organic Compound | Monomer | Example | Function |
|---|---|---|---|
| Carbohydrates | monosaccharide | bread | store |
Understanding the Immune System: Barriers, Cells, and Responses
EXTERIOR BARRIERS: Their Importance in Preventing Pathogen Entry
Primary Barriers
2.1. Anatomical or Mechanical Barrier
The skin acts as a physical barrier, containing fatty acids and commensal microorganisms that help prevent pathogen entry. Mucous membranes, with their wet epithelium, serve as the body’s first line of defense against microorganisms.
2.2. Chemical Barrier
Various substances, such as sweat (acidic pH of 3.5), gastric acid (pH 1 to 2), and basic duodenal fluid (pH 8), inhibit bacterial
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