University:
University of New Mexico
Course:
BIOL 412 | Developmental Biology
Academic year:

2020
Views:

486

Pages:

1
Author:

Lance Gutierrez

Levels of Organization-- Answer key Review of Cells ● Cells are the smallest unit of life ● There is smaller than a cell that is living ● Cells are specialized for certain jobs ○ Each one has a specific job to perform ● Cells DO NOT work alone -- they depend on each other to function. Tissues ● Tissues are groups of cells working together to perform a specific job ● There are several different types of tissues: ● Muscle -- soft tissue making up muscles ● Connective -- connects, supports organs ● Epithelial -- skin ● Nerve-- main part of the nervous system ● Each type of tissue performs a specific job. Organs ● Organs are : Groups of tissues working together to perform a certain job ● Different organs in our bodies have different jobs to do: ○ Examples: HEART: pumps & circulates blood throughout the body LUNGS: organs responsible for exchanging gases STOMACH: breaks down food BRAIN: control organ for entire body ● If one organ quits working and doing its job, other organs may quit working also. Organ Systems ● Organ systems are the highest level of organization within an organism ● An organ systems are: groups of organs working together to perform a specific job ● Examples include: cardiovascular system, nervous system, digestive system ● If an organ system begins to fail, other organ systems may stop working and the organism may die. Organism ● ● ● ● This is the highest level of organization. Any living thing is called an organism, no matter if it’s one-celled or many-celled. An organism is a collection of cells, tissues, organs, and organ systems. What are some examples of organisms? Humans, cats, dogs, fish, bacteria, trees, plants