cells and systems vocab Flashcards
what is a cell?
the smallest unit that can perform the functions of life
what is the nucleus?
in a cell, an organelle that controls the cells activities
what is an organelle?
structure within a cell that has a specific function
what is a vacuole?
in a cell, a fluid filled organelle that stores, water, food, wastes, and other materials
what is an artery?
a blood vessel that carries oxygen-rich blood from the heart
what is a semi- permeable membrane?
allows only certain materials to pass through
what is diffusion?
the movement of particles in liquids and gases from an area of high concentration to an area of lower concentration
what is tissue?
a group of cells havingthe same structure and function
what are capillaries?
smallest type of blood vessel; connects arterys and veins
what is the cell membrane?
a selectivly permeable structure enclosing the contents of a cell or organelle; regulates passage of substances in and out of an organelle
what is a cell wall?
a rigid structure surrounding the cell membrane of plants, fungi and some unicellular organisms; protects and supports walls
what is a cytoplasm?
the gel like substance within the cell membrane that contains and supports the structures of the cell
what is a chloroplast?
an organelle that contains chlorophyll and enables plants to make carbohydrates through photosynthesis (in plants and some unicellular orginisms
what is a vein?
a blood vessel that carries blood back to the heart
what is a villus?
a tiny fingerlike projection on the inner lining of the small intestine
