Which lists three living units of the human body in order from the simplest to the most complex level of organization?
Answers
Question - Which lists three living units of the human body in order from the simplest to the most complex level of organization?
red blood cell → circulatory system → blood
nervous system → nerves → brain
red blood cell → heart tissue → circulatory system
bone tissue → skeletal system → bone
Answer - The correct order as required is - red blood cell → heart tissue → circulatory system
The ranking from simpler to complex level is - cell, tissue, organ, organ system and then organism.
Cells are the simplest unit of life which accumulate together to form a tissue.
In a tissue, all the cells are of specific type and perform their function according to tissue. Example muscular tissue.
Specific type of tissues combine together to form an organ which performs function like exchange of gases, pumping blood. Example brain, kidney, heart.
The organ system involves all the organs involved in particular function of body. Example digestive system includes stomach, intestine, gastrointestinal tract.