Understanding Health, Disease, and Their Indicators
Theme 1: Health and Disease
1. Health and Disease
1.1. Introduction
Defining the concept of health is not easy, yet it is universally understood. Its meaning has changed significantly throughout history, from prehistoric humans with a magic-religious view of life to the scientific and rational humans of modern times. It has been widely believed that health is the absence of disease. However, this is a vague concept, as many situations exist where it’s impossible to establish a clear boundary between
Read MoreVegetables: Nutritional Value, Cooking, and Preservation
Vegetables: Nutritional Powerhouses
Vegetables are edible plants that can be enjoyed raw or cooked. Their basic structural unit is the plant cell, and they are excellent sources of fiber and essential phytochemicals.
Popular Vegetables Grown Worldwide:
- Tomato
- Cauliflower
- Onion
- Cucumber
Parts of Vegetables:
Roots:
The plant’s body responsible for nutrition and sugar storage (e.g., radish, turnip, beet, carrot).
Underground Stems:
Thick underground stems that store starch (e.g., potato, sweet potato, yam, cassava)
Read MoreAnatomy and Physiology of the Ear: From Outer to Inner Ear
External Ear
The external ear is composed of the pinna and ear canal.
Pinna
The pinna, or auricle, is an irregularly folded, sheet-like structure that protrudes from the side of the head. It is attached around the external auditory meatus of the temporal bone. The central depressed area is called the concha and is surrounded, especially above and behind, by two prominent ridges: the helix and the antihelix. These ridges are separated by a distinct groove.
In front of the lower concha is the entrance
Read MoreIntroduction to Public Health and Diseases
Health and Disease
What is Health?
Health is a state of complete physical, mental, and social well-being. It is influenced by a series of factors such as:
- Heredity: Genetic factors
- Environment: Physical and chemical factors
- Personal Behavior: Lifestyle choices like diet and exercise
- Access to Health Systems: Availability of healthcare services
Health Risk and Risk Factors
Health risk is the probability of an event or damage to health that can cause illness or death. A risk factor is any circumstance or
Read MoreHeart, Kidney, and Urinary System Anatomy
Heart
Structure
The heart is a hollow, muscular organ responsible for pumping blood throughout the body. It is divided into four chambers: two atria (upper chambers) and two ventricles (lower chambers). The heart is enveloped by a protective membrane called the pericardium.
Layers of the Heart (from inside out):
- Endocardium
- Myocardium
- Epicardium
Chambers of the Heart:
- Top: Right Atrium, Left Atrium
- Bottom: Right Ventricle, Left Ventricle
The atria are separated by the interatrial septum, and the ventricles
Read MoreThe Nervous System: Structure, Function, and Divisions
The Nervous System
The nervous system allows the body to react to internal and external environmental changes. It controls and integrates various bodily activities.
Divisions of the Nervous System
Structurally, the nervous system is divided into the Central Nervous System (CNS) and the Peripheral Nervous System (PNS).
Functionally, it’s divided into the Somatic Nervous System (SNS) and the Autonomic Nervous System (ANS).
Nerve Tissue
Nerve tissue comprises two main cell types:
Neurons
Neurons are characterized
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