Levels of Biological Organization

Flashcards covering the key concepts of levels of biological organization, including cells, tissues, organs, organ systems, and organisms.

What are the five levels of organization in multicellular organisms, from smallest to largest?

Cell, Tissue, Organ, Organ System, Organism.

Who is credited with the discovery of the cell?

Robert Hooke.

What is the most basic unit of structure and function of all living things?

Cell.

What tool is needed to view cells due to their small size?

A microscope.

What type of cells did Anton van Leeuwenhoek first observe?

Living cells.

What are groups of similar cells performing the same function called?

Tissues.

What type of tissue connects, supports, or surrounds other tissues or organs?

Connective tissue.

What type of tissue covers body surfaces, body cavities, and organs?

Epithelial tissue.

What are the five vital organs of the human body?

Brain, heart, kidneys, liver, and lungs.

How many organs are in the human body?

78 organs.

What are a group of organs that work together to perform a specific function called?

Organ systems.

How many organ systems are present in the human body?

11 organ systems.

What type of tissue composes muscles that can contract to produce movement?

Muscular tissue.

What is the role of nerve tissue?

To receive stimuli and conduct impulses in the body.

What defines an organism in biological terms? (3 things)

A living individual that can reproduce, grow, and maintain homeostasis.

How many kingdoms of life can organisms belong to?

Six kingdoms.

Approximately how many species of organisms are estimated to be on Earth?

About 8.7 million species.

Can a raccoon be classified as an organism?

Yes, it is a living individual.

Give an example of an organism?

Penguin, a human, a dog, a horse…

What is a group of tissues that work together to perform a specific function called?

An organ.