Post on 01-Jan-2016
transcript
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.
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
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
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 SystemMajor 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.
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