Notes, summaries, assignments, exams, and exercises for Biology for Secondary education

List the Most Important Functions of Blood

• Heating: transporting or regulating body heat
• Transport nutrients and O2 to the cell
• Defense mechanism against pathogens
• Transport CO2 waste from cells
• Transport of hormones: insulin

Why the Circulatory System is Vital

• Because it keeps the cells provided with what they need and removes what they need to get rid of.
• By blood is the means by which some organs influence other organs to perform functions (HORMONES)

Identify the Main Types of Blood Vessels

Observe the Blood Components

A. CENTRIFUGATION...

PLASMA...

Digestive System Fundamentals

1. What does the mucous membrane do? It absorbs nutrients and protects the surface of the duct.
2. What is the function of the large intestine? It absorbs water and electrolytes.
3. What types of digestion occur in the mouth? There are two types: physical and chemical.
4. What organs are located on the right side of the abdomen? Primarily the liver and the gallbladder.
5. What is the epiglottis? A flap of cartilage that prevents food from entering the trachea.
6. What are the two valves of the stomach? The cardiac (esophageal) sphincter and the pyloric sphincter.
7. What is the function of the salivary glands? They produce saliva to begin chemical digestion.
8. What are the two types of carbohydrates? Simple and complex carbohydrates.
9. What are

Food and Nutrition Fundamentals

Key Definitions

Nutrition

The study of nutrients in food, how the body uses them, and the relationship between diet, health, and disease. It involves taking in matter and energy to grow, survive, and reproduce; waste matter and waste energy are produced as by-products.

Food

Any solid or liquid substance consumed to provide nutritional support for an organism.

Nutrients

Compounds in foods essential to life and health, providing us with energy, the building blocks for repair and growth, and substances necessary to regulate chemical processes.

Types of Nutrients

Nutrients are classified into two main groups:

• Inorganic compounds: Water and mineral salts.
• Organic compounds: Carbohydrates, Fats (Lipids), Proteins, and Vitamins.

Common Circulatory System Disorders

• Thrombosis: Occurs when a blood clot causes a blockage in a blood vessel, which can lead to a heart attack or stroke.
• Leukaemia: A type of cancer characterized by an excess of white blood cells.
• Anaemia: A condition where there are not enough red blood cells in the body.
• Arteriosclerosis: Occurs when artery walls become harder due to the buildup of fats and cholesterol.
• Atherosclerosis: When plaque on an artery wall prevents blood from flowing through the artery.
• Myocardial Infarction: Commonly known as a heart attack, caused by a blockage of blood flow in one of the heart's coronary arteries.
• Hemophilia: A hereditary, inherited condition where blood cannot clot properly because of a lack of blood-clotting proteins

Essential Nutrients for Adolescents

Fruit and Vegetables

These are essential every day. Fruit juice, for example, rich in vitamin C, contributes to preventing reduced defenses at a time of change like adolescence.

Dairy

Daily consumption of dairy products promotes growth and provides the calcium you need to properly feed your skeleton.

Fish and Seafood

Oily fish (Tuna, sardines, salmon, and mackerel) is especially recommended because it provides high concentrations of vitamins A and D, much needed during periods of growth. Squid, cuttlefish, and mussels are also high in RD.

Proteins

Are vital for building strong muscles and also for proper brain function. If you do not eat enough protein, your intellectual ability will be diminished. Do not forget...

Traits are characteristics present in an organism that can be inherited by its offspring.

Homozygotes and Heterozygotes

• Two identical alleles (AA or aa): Homozygous
• Two different alleles (Aa): Heterozygous

A: Dominant allele

a: Recessive allele

Genotype is an organism's set of genes.

Phenotype is the way in which...

Ectoparasites: True or False Statements

Test your knowledge on ectoparasites with these statements:

• Ectoparasites do not produce skin lesions. False (Many ectoparasites, like scabies mites, cause significant skin lesions.)
• Skin appendages are infested by ectoparasites. True (This includes hair, sebaceous glands, and sometimes nails.)
• Infestation by head and body lice refers to Bediculosis. False (The correct term is Pediculosis.)
• Hair and sebaceous glands are parts that can be affected by ectoparasites. True
• Ectoparasites are considered organisms. True (They are living organisms that live on the exterior of a host.)
• Many reports of ectoparasitic diseases have disappeared. False (Ectoparasitic diseases remain prevalent globally.)
• Scabies are not found

The Human Eye

Structure and Function

The Retina

The retina is a structure at the back of the eye that contains light-sensitive cells called rods and cones.

• Rods: Detect different light intensities, see in black and white, sensitive to low light levels, used to see in dim light.
• Cones: Different types sensitive to different colors (especially primary colors), need bright light to work, cannot see in dim light.

The central part of the retina has a lot of cone cells and no rod cells. The outer part of the retina has no cone cells and a lot of rod cells.

Blind Spot

The blind spot is the point where the optic nerve leaves the eye. There are no receptor cells in this area.

Cornea

The cornea is the transparent front part of the eye. It protects the eye and...

Nervous System: The Body's Control Center

The Nervous System controls, processes, and responds to information, coordinating the body's activities.

Neuron: The Basic Unit of the Nervous System

The neuron is the basic structural unit of the nervous system. Neurons conduct impulses throughout the nervous system and consist of three regions:

• Axon
• Dendrites
• Cell Body

Dendrites and Axons: The Neuron's Extensions

Dendrites are extensions of the neuron that receive impulses and carry them toward the cell body.

The axon is an extension of the neuron that carries impulses away from the cell body toward other neurons, muscles, or glands.

Three Categories of Neurons

Neurons are categorized into three types:

1. Sensory Neurons: Carry impulses from the body to the spinal