Bodies and systems
A collection of similar tissues joined together into a structure that performs a specialized function
Organ
A nerve ending that sends signals to the central nervous system when it is stimulated
Sensory Receptor
The basic structural and functional unit of living things
Cell
A lipid barrier that encloses the cytoplasm and controls what enters and exits the cell
Cell Membrane
An action or condition that provokes a response
Stimulus
A self-contained living thing
Organism
A chemical that enters the body
Chemical input
A category of organisms made up of more than one cell and of different types of cells
Multicellular
A tough, protective barrier that surrounds the outer membrane of some types of cells
Cell Wall
Takes in oxygen and removes carbon dioxide
Respiratory system
A mass of similar cells that perform a specialized function
Tissue
Signals that enter the body in the form of electromagnetic stimuli
Electromagnetic input
A category of organisms made up of one cell
Unicellular
A membrane-bond organelle in plants that is the site of photosynthesis
Chloroplast
The organ that serves at the primary control center of the nervous system in all vertebrate and most invertebrate animals
Brain
A self-contained system within a larger system
Subsystem
Signals that enter the body through physical touch or vibration
Mechanical input
A structure inside a cell that performs a specialized function
Organelle
The organelle that functions in energy production; the power factory of the cell
Mitochondrion
Breaks down food into nutrients
Digestive system
Multicellular organisms have various levels of organization within them. The levels of organization create a hierarchy from simple to complex. What is the level starting from simple
Cell - tissues - organs - organ syatems - Organism
A cell specialized from transmitting fast electrochemical signals
Nerve cell
Scientists divide organisms into two main groups based on their cell structure what are they
Prokaryote and Eukaryote
A membrane-bond organelle in eukaryotic cells that contains the DNA; control center of the cell
Nucleus
Removes waste from body
Excretory system