1. Tissues, Organs and Systems
What do they all do?
How do they all work together?

2. Tissues, Organs and Systems
Humans are highly organized
Composed of many cells = multicellular
cellstissuesorgansorgan systems
Organic molecules = carbon-containing building blocks of life

3. Tissue Structure and Function
Cellular Components - Tissues
A tissue is a group of similar cells specialized for performing a common function.
Different types of tissues have different structures that are suited to their functions.
Tissues are classified into four main categories:
Epithelial
Connective
Muscle
Nervous

4. Epithelial Tissue Definition
Surface or coverings of organs and body parts, examples include skin, lining of the intestine, etc
Purpose:
Protection
Secretion
Absorption
Filtration

6. 1.Protection Skin protects you from external threats
Stomach epithelial cells keep the acid inside the stomach to digest the food and not other internal organs!

7. 2.Secretion Mammary glands secrete milk for nursing infants
Salivary Glands allow saliva to be secreted into your mouth so that you can begin digesting food
Mammary glands secrete milk for nursing infants

8. 3. Absorption
Food (nutrients) are mostly absorbed in the small intestine by the epithelial cells

9. 4. Filtration Red Blood Cells
Arteries bring oxygen and nutrients to cells and then exchange it for carbon dioxide and other wastes
Waste carried to kidneys and liver via the veins

10. Connective Tissue Definition
Supports, binds and connects tissues to one another.
Can be physical or functional

11. 1. Physical Connective Tissue
a) Bone: physically supports the body
c) Tendons: connects muscle and bone
b) Ligaments: connects bone to bone to form a joint

12. 2.Functional Connective Tissue
Fat is a functional support because it stores fat to be used as energy as required
Blood tissue is also functional because it supplies the body with…..
OXYGEN

13. Muscle Tissue Definition
Cells designed to contract and therefore allow movement

14. 3 Main Types of Muscle cells
Skeletal
Smooth
Cardiac

15. 1.Skeletal Muscle Tissue
Muscle attached to bone,
For example, calf muscle, biceps, etc
Muscles contract VOLUNTARILY (with nerve stimulation)

16. 2. Smooth Muscle
Muscle found within our internal organs such as the intestine, bladder and blood vessels
Muscles contract INVOLUNTARILY (without nerve stimulation)

17. 3. Cardiac Muscle
Used to pump blood, therefore this muscle is INVOLUNTARY too

18. Nervous Tissue Definition
Groups of nerve cells that send electrical impulses (signals) to the brain

19. The NEURON

20. How neurons work
Neurons send signals for sensing and reacting to our environment (touch – hot or cold, pressure receptors, etc)
They transmit messages to and from the brain

21. Organs
Organs are made of 2 or more different types of tissue, working together to perform a specific function within the body. For example, the heart functions as a pump within the body.

22. ORGAN SYSTEMS DEFINITION
2 or more ORGANS working together to perform a specific function
Examples include
Circulatory System
Respiratory System
Digestive system
Nervous system
Reproductive system
Skeletal system
Urinary System

23. Digestive System
Breaks down and absorbs food and nutrients and then helps get rid of the waste

24. Respiratory System The main function is the exchange of gases:
Oxygen IN
Carbon Dioxide OUT

25. Nervous System
The main function to relay messages throughout your body

26. To Do
Look through pages and try to classify the specialized cells into the categories we just looked at.
Answer #1, 4, 5, 6 on p.60
With the use of your notes and pages answer #2 – 6 on p. 76