1. Amphibians

2. Objective of the Day
Compare and contrast the fish’s structure, circulatory system, and respiratory system to the amphibian’s structure, circulatory system, and respiratory system.

3. Characteristics of Amphibians
Tetrapod Vertebrate
- (Are fish Vertebrates?)
-(What phylum are amphibians in?)
Can live in both terrestrial and aquatic environments.
- (Can the fish live in both aquatic and terrestrial environments?)
Spend the most of their larvae stage in aquatic environment and most of their adult stage in terrestrial environment.
Skin is moist and is used to exchange oxygen for carbon dioxide.
- (Key reason why that terrestrial adult amphibians stay close to places with water)

4. Life Cycle of a Frog

5. Tail Structure of Amphibians
In the larvae stage of a frog, they have a tail.
As the frog grows into an adult, the tail disappears because it get digested by lysosome.

6. Respiratory System of Amphibians
In larvae stage, gas exchange takes place in the skin and the gills.
As the amphibians becomes adults, lungs are developed and takes over the gills.
The lungs are derived from the air bladder of the bony fish.
-(What is the air bladder used for in fish?)

7. Respiratory System of Amphibians
Amphibians are cold blooded animals which means that they used less oxygen compared to warm blooded animals.
Amphibians has a pulmocutaneous circuit.
- (What was the name for the fish circuit?)
Amphibians have two types of respiration called the pulmonary respiration and cutaneous respiration.

8. Pulmonary Respiration
Gas exchange takes place in the lungs.
- (Do you think the frog is still in the larvae stage or adult stage?)
- (Where does the fish gas exchange takes place?)
In the gas exchange, oxygen are diffused in and carbon dioxide are diffused out.

9. Cutaneous Respiration
Respiration through the skin
- (Remember that amphibians can used both the skin and the lungs as respiration)
The skin uses water capillaries for the gas exchange
In the gas exchange, oxygen are diffused in and carbon dioxide are diffused out.
- (Was this the same as the pulmonary respiration?)

10. Amphibians Respiratory Structure
Amphibians breath through their nostrils and down into their lungs
(Similar to humans)
They do not have a ribs or diaphragm (Not similar to humans)
As a result, amphibians chest do not expand but instead their throat expand to intake air from the outside environment

11. Recap of the Amphibian Respiratory system
Mudpuppy (Salamander) -

12. Circulatory System of Amphibians
Have a three chambered heart
-(Fish has a ? Chamber(s) heart?)
The three chambers include two atria and one ventricle.
-(Fish has how many ventricles and how many atria?)
Have a double circulation arrangement.
- (Did fish have a double circulation arrangement?)

13. Circulatory System of Amphibians

14. Circulatory System Continued
Amphibians has two atria and atria is the receiving chambers (AIR)
Amphibians has one ventricles and ventricle is the pumping chamber (VIP)
Arteries- carries oxygenated blood from heart to body part
Veins - carries deoxygenated blood from body parts to heart

16. Interesting facts about Frogs