The body Flashcards
molecules
two or more atoms joined (bonded) together, forming a small particle
cells
the smallest unit of life. Cells are the building blocks of living things. There are many different sized and shaped cells in animals and plants, as well as single-celled organisms.
tissues
groups of cells performing the same function
systems
group of organs working together
cellular respiration
the chemical reaction involving oxygen that moves the energy in glucose into the compound ATP. The body is able to use the energy contained in ATP.
respiratory system
the body system involving the lungs and associated structures, which take in air and supply the blood with oxygen to deliver to the body’s cells so they can carry out their essential functions; it also performs gas exchange to remove the waste gas carbon dioxide
circulatory system
the body system that circulates oxygen in blood to all the cells of the body. The circulatory system consists of the heart, the blood vessels and blood.
blood cells
any of the many types of cells found in blood including red and white blood cells
blood vessels
the veins, arteries and capillaries through which the blood flows around the body
heart
a muscular organ that pumps blood through the circulatory system so that oxygen and nutrients can be transported to the body’s cells and wastes can be transported away
arteries
hollow tubes (vessels) with thick walls carrying blood pumped from the heart to other body parts
capillaries
minute tubes carrying blood to body cells. Every cell of the body is supplied with blood through capillaries.
veins
blood vessels that carry blood back to the heart. They have valves and thinner walls than arteries.
digestive system
a complex series of organs and glands that processes food to supply the body with the nutrients it needs to function effectively
excretory system
the body system that removes waste substances from the body
