With 37 trillion cells in a human body, we better know what a cell is and what it is made of. Cells are the smallest functional unit of an organism.
The science of classifying organisms according to their similarities and assigning them to groups.
Plant kingdom includes every plant we encounter from the tiny to the giant Sequoia trees.Plants are autotrophs and they can make their own food by photosynthesis.
Genetics is the study of heredity and the process of a parent passing certain genes to their offspring (next generation).
Microbes are tiny organisms that live everywhere around us, which we can’t see with the naked eye. They exist in dirt water, in animals, the air we breathe and even in our guts. There are beneficial microbes and there are harmful microbes.
Humans have five vital organs: brain, heart, kidneys, liver and lungs. The human body contains nearly 100 trillion cells. The human brain contains about 100 billion nerve cells.
Evolution is change in the heritable characteristics of populations over successive generations. Evolutionary processes end up in increased biodiversity. Some terms: Species, natural selection, variation.
The system of moving blood around the human body is called the circulatory system. This includes heart, lungs, and our arteries and veins.
The human digestive system is composed of a team of organs that work together to digest and absorb food. These organs link together to form a long tube called the gut (alimentary canal). Human gut ( 30ft long).
The respiratory system consists of the nose, nasopharynx, trachea and lungs. It brings oxygen in and pushes carbon dioxide and water back into the air.
Human skeleton includes bones, ligaments, tendons, and cartilage. It is responsible for body structure, movement and bone marrow also produces blood cells.
The organ system by which humans reproduce, bear live offspring and genes are passed on to children from their parents.
The nervous system consists of the central nervous system (the brain and spinal cord) and the peripheral nervous system (the nerves that carry impulses to and from the central nervous system).
The muscular system contains three types of muscles: skeletal, smooth and cardiac. There are 650 muscles in the body that support movement, posture, and circulate blood throughout the body.