What is a Pathogen?
A pathogen is an agent that causes infection or disease. Many diseases that affect animals and plants are caused by ...
Variation in living creatures
Variation is the term used to describe the physical differences between individuals of the same species. Humans are all part ...
Vaccination and the manufacture of memory cells
A vaccination is where a person is provided with artificial immunity to a disease without actually ever having the disease ...
Transpiration
Transpiration is part of the water cycle. It is the loss of water vapour from parts of a plant. The ...
The structure of the human heart and its functions
The human heart pumps blood around the body. The wall of the heart is made of cardiac muscle, enabling it ...
The respiratory system in humans
The human body’s cells get their energy through the process of respiration. In order to create the right amount of ...
The process of respiration
Respiration is the chemical reaction that occurs in all living cells. It is the process involving the production of energy ...
The organism in the environment
A habitat is the place where an organism lives. It includes the places where the organism finds food, mates, sleeps ...
The human eye
One of the organs that we use the most to detect stimuli is the eye. With sight we can locate ...
The function of the digestive system
The human alimentary canal, also known as the digestive tract/system, is the pathway in which food enters and leaves the ...
The difference between eukaryotic organisms and prokaryotic organisms
Eukaryotic organisms, also known as eukaryotes, include animals, plants, fungi and protoctists. Eukaryotic organisms are normally multicellular and are defined ...
The composition of blood
Large, multicellular animals require a circulatory system to transport substances to and from the cells in the body. The circulatory ...
The changes of heart rate
On average, the heart beats approximately 70 times per minute. However, this rate can change according to different circumstances, for ...
The biological consequences of smoking
A single cigarette contains thousands of different chemicals, the majority of which are harmful to the human body. Smoking affects ...
Stem cells
Stem cells are immature cells that have the ability to renew and differentiate to form different types of cells; in ...