Transcript I. Types of Cells A. Branching Cells 1. nerve cells

Ch 2 Lesson 2: How do cells work together?
I. Types of Cells
A. Branching Cells
1. nerve cells-helps communicate signals from
the brain to the rest of the body
B. Flat Cells
1. Join or overlap to cover a surface
a. Ex. skin cells, line the mouth and
stomach
C. Round Cells
1. rounded discs with two dimples to
help pick up oxygen/smooth
shapes help it move easily through
the blood
a. Ex. red blood cells
D. Cilia
1. waving hair-like structure
2. sweep away dirt and germs out
of the airway in the lungs
Cells
Tissue
Organs
Organ Systems
Example:
Nerve Tissue
Skin Cells
Skin Tissue
Muscle Tissue
Organism
Skin
(Organ)
Ch 2 Lesson 3: How do organs work
together?
I. Organ Systems- group of organs working
together
A. Skeletal System- each bone is an organ
1. strong support system
2. protect internal organ
B. Muscle System- each muscle is an organ
*****Muscles only pull NEVER push****
1. move your body
II. Organ Systems Work Together
A. Muscle, Skeletal and Nervous System
1. Example: Triceps on the back of your
arm bone/ Bicep connect to the front
of your arm bone; Tricep pulls- arm
straightens, Biceps pulls-arm curls;
bone is the support system: Nerves
tell the arm to move from the brain