2A Cells, Tissues, Organs & Systems Flashcards
Cells
Building blocks of all living things
Tissues
Made of similar cells
Organs
Made of tissues
Systems
Organs work together
Diffusion
Movement of molecules from a higher to a lower concentration
Digestion
Breaking down food into smaller pieces
Absorption
Movement of small molecules into the blood
Alveoli
Air sacs where gas exchange takes place in the lungs
Arteries
Blood vessels that carry blood away from the heart
Capillaries
Blood vessel where substances can move in and out of the blood
Vein
Blood vessel that carries blood back into the heart.
Brain
Controls the body, stores memories and controls personality.
Heart
Pumps blood around the body
Stomach
Stores and churns food - helps digestion
Small Intestine
Where food is absorbed into the blood
Kidneys
Cleans the blood and excretes waste through urine
Large intestine
Water is absorbed and waste is prepared here.
Roots
Anchors the plants and absorbs water and nutrients
Stem
Transports water and nutrients around the plant
Leaf
Site of photosynthesis
Flower
Reproductive organs
Respiration
Chemical reaction that takes place in all cells - releases energy from food
Oxygen
Gas needed for respiration to take place
