definitions unit 2 Flashcards
cell
the smallest unit that can perform the functions of life
multi cellular
many cells
unicellular
one cell
organelles
a structure within a cell
selectively permeable
allowing only certain materials to pass through
permeable
allowing materials to pass through
impermeable
allowing no materials to pass through
vascular tissues
in plants tissues that connect the root system and the shoot system
phloem tissues
in plants tissues that sugars to the rest of the plant
xylem tissues
in plants the tissue that conducts water and minerals absorbed by root cells to every cell in the plant
root hairs
on a plant root the single epidermal cell
transpiration
the loss of water from a plant from evaporation
tissues
a group of cells having the same function or structure
organs
a group of tissues that work together to perform a specific function
digestive system
a group of organs that work together to break down food and eliminate wastes
respiratory system
a system that moves air in and out of the body
circulatory system
a system that transports food and oxygen throughout the body
alveoli
in the lungs a tiny sacs that are on the end of a bronchiole
capillaries
the smallest type of blood vessels that connects arteries and veins
excretory system
the system that regulates blood composition and gets rid of waste fluids
nervous system
body system that senses internal and external changes, it controls an co-ordinates body activities
artery
a blood vessel that carries oxygen-rich blood from the heart
guard cells
in leaf: cells that surround openings called stoma
nuclear membrane
thin outer membrane that surrounds the cells nuclease
