the tiniest blood vessel that carries blood from the arteries to veins

the firm outside covering of a plant cell

the body system that moves blood throughout the body

a condition, other than one caused by injury,that prevents a part of the body from working normally

an organism of microscopic size, such as a virus or single bacteria cell

tissue that produces movement and force by contracting and relaxing

the cell part that controls a cell’s activities

the invisible, odorless gas that makes up part of the air humans must breathe to live

the liquid part of blood in which blood cells flow

the body system that controls breathing by inhaling oxygen and exhaling carbon dioxide

composed of only one cell

a blood vessel that carries blood back from the body’s to the heart

small one-celled organisms that sometimes cause infections and disease

the smallest independently functioning unit in an organism

a material in green plants that can turn water, air, and sunlight into food

the liquid that lies inside the cell membrane

a collection of cells and organs in the human body that protect against disease-causing germs

 composed of more than one cell

cell parts that produce energy

the body system that allows internal and external body parts to move

a substance in food or soil that organisms need to live, stay healthy, and grow

a unicelluar organism that causes disease

a tiny opening

the body system that provide a sturdy frame to support all other body systems

a medicine made of weak or dead microbes that teach the body to fight stronger microbes of the same type

a microorganism that invades and takes over a living cell, often causing a disease or infection

a cell part that stores water, nutrients, and wastes

a group of cells in an organism that is similar in form and function

the heartbeat as felt through the walls of blood vessels

the process that plants use to make their own food

a part of an organism made of different kinds of tissue , that has a specific function.

body system that gathers information from & responds to the senses,& affects thinking & behavior

the invasion of the body by bacteria, viruses, or other organisms which sometimes cause disease

the body system that breaks down food to give the whole body the nutrients it needs

a part of a plant cell that contains chlorophyll & makes energy from the sun, air, water, and nutrients.

the outside covering of an animal cell that is also inside the cell wall of plant cells

group of organs in the body that work together

chemicals produced by the body that attack invading germs