Warm-up 1. Based on your understanding about how living things are organized, describe the levels of organization. 2. What do you think is the most important part of the human body? Explain why.

Body Systems Learning Intention: To understand the function of the various systems in our body

All organisms are made of cells Cells are organized into tissues 4 types of Tissues: a.Epithelium – covers the body and lines the organs b.Muscle – contractile c.Skeletal- provides support & produces blood d.Nervous – transmits signals that regulate body systems

The Human Body Works together to maintain homeostasis All systems communicate for homeostasis

Homeostasis: Stable control of the bodies processes Temperature, pH levels, oxygen amounts

Systems

1. Digestive- Receives food and breaks it down into simpler molecules that can move through the cell membrane. Transported to all parts of the body by the blood stream

2. Respiratory – Filters air and allows gas exchange between lungs and blood. Oxygen is taken in and carbon dioxide is released.

3. Cardiovascular: a.Heart b.Blood: Transports oxygen from lungs and nutrients from the digestive tract through out all of the body tissues. Carries carbon dioxide from cells back to lungs to be removed. Carries waste to excretory system. c.Blood vessels: arteries, capillaries, veins

4. Excretory: removes metabolic waste, maintains homeostasis and filters blood. Includes: Kidneys and Bladder.

5. Nervous: Mediates communication between different parts of the body and interactions with the environment. Brain, Spinal Cord, Nerves

6. Endocrine: Controls metabolic activities Includes glands and the hormones that they secrete.

The Digestive System Think Pair Share: What is the purpose of the digestive system????

Video Clip Travelling through the Digestive System Learning Intention: To understand the function of the various systems in our body Success Criteria: I can name and explain the vital function of each organ of the digestive system.

The Digestive System Major Organs Mouth: Mechanical Digestion Chemical Digestion, enzymes such as salivary amylase digest starch into monosaccharide

Stomach Mechanical Digestion Chemical Digestion – gastric juice (pepsin and hydrochloric acid) Pepsin: digests proteins

Small Intestine: more digestion and absorption of small molecules into cells and then into the blood.

Large Intestine: Water, salts, and vitamins are absorbed and the waste is removed.

Accessory Digestive Organs Pancreas: produces digestive enzymes and hormones Liver: Produces bile Bile breaks down fats Gallbladder: Stores bile and transports it into the small intestine

Feedback Loops The mechanism by which the nervous system uses the endocrine system to communicate.

Endocrine System Information signaling system that regulates: Growth Development Metabolism Mood

The main Endocrine System structures –Hypothalamus –Pituitary gland –Thyroid Gland –Parathyroid Gland –Adrenal Gland – Pancreas

Important Endocrine Signaling Molecules 1. Insulin secreted by the pancreas. - Maintains homeostasis of blood glucose levels 2. Thyroxine secreted by the thyroid gland. - Regulate metabolism 3. Oxytocin secreted by the pituitary gland. - Regulates emotional responses 4. Adrenaline secreted by the adrenal glands. - Neurotransmitter that regulate the fight or flight response

What is a target cell and receptor? Hormones = signal Receptor = receives the signal Target Cell = a specific cell type that has the specific receptors that receive the signal

What is a negative Feedback Loop?

A process in which a change will signal a response that opposes that change.

Time to Review Today’s Lesson On the sticky note provided –Write and answer 2 questions about what we learned today –You may use your notes

The End