biological systems🌏

• unicellular organisms

  organisms with one cell, they must carry out all functions in one cell
• multicellular organism

  a community of cells that work cooperatively for survival and reproduction, they share these functions between their specialised cells.
• what does a cell have to be to be considered multicellular (1)

  cells must have the same dna
• what does a cell have to be to be considered multicellular (2)

  ‣cells must be connected, communicate and cooperate to function for a single organism.
• what does a cell have to be to be considered multicellular (3)

  ‣must have different cells that are specialised and responsible for specific functions.
• what does a cell must have to be considered multicellular (4)

  cells must be dependent on each other for survival
• define tissue

  a group of specialized cells working together to peform a specific function
• define organ

  two or more types of tissues act together to peform one or more specific functions
• define organ system

  a group of organs working together to perform a complex task vital to an organism’s survival. The bigger the organism, the greater the need for cooperation 
• what are organisms made up of

  cells, tissues, organs, organ system
• animal cells combine to form what four major animal tissue types

  muscle, nerve, epithelial, and connective
• define muscle tissue and function

  contracts to exert a force, three major types of muscle tissues: cardiac, skeletal, smooth muscle tissue
• define nervous tissue and function

  detects stimuli and transmits electrical signals
• define connective tissue and function

  connects and supports other tissues and organ structures of the body
• define epitheial tissue and function

  composes the external and internal layers of the body, these tissues assist in protection, secretion, and absorption
• function of digestive system

  breaks down and processes food to be used by the body, eliminates food waste that is not digested via egestion
• function of excretory system

  removes waste substances from the blood via excretion, assists in the control of water balance in the body
• function of endocrine system

  responsible for the production and secretion of hormones which control and regulate bodily processes
• example of organ and tissue in the digestive system

  stomach, liver, pancreas, small intestine, large intestine
• examples of tissues and organs in the excretory system

  kidneys, bladder, lungs
• examples of tissue and organs in the endocrine system

  hypothalamus, thyroid gland, thymus, pancreas, adrenal gland
• what are tissue


  tissue are made of the same type of cells grouped together to do a specific job
• what four kind of tissues do humans have

  epithelia, muslce, connective, nerve
• what are organs


  organs are made up of different tissues that work together to do a job
• multicellular organisms ogranization


  multicellular organisms have many more levels of organization to make sure the whole body can work correctly, even when it is doing many things at the same time.
• muscle tissue


  contracts to exert a force, three major types are cardiac,skeletal, smooth muscle tissue
• nervous tissue


  detects stimuli and transmits electric signals
• connective tissue


  connects and supports other tissues and organ structures of the body
• epithelial tissue


  composes the external and internal layer of the body, these tissues assist in protection, secretion, and absorption