During digestion complex molecules are broken down and then used to build needed molecules and to produce energy

Animals take in complex molecules from the environment for energy production

CB 41.21

Physical digestion:liquefying of food

Chemical digestion:breaking large moleculesinto small molecules

CB 41.16

Amylasein mouth

Chewing and adding saliva begins the process of liquification

Amylase begins the chemical digestion of carbs

CB 41.15

The primary function of the stomach is food storage

CB 41.17

Pepsinin stomach

Pepsin begins the chemical digestion of proteins.

In the stomach liquification continues.

Pepsinin stomach

pH

enzy

me

acti

vity

basicacid

CB 41.15

The Digestive System

CB 41.17

Most chemical digestion occurs in the first part of the small intestine

CB 41.23

The small intestine has a large surface area to aid in absorbption of nutrients

CB 41.23

Absorptionin the SmallIntestine

CB 41.15

The Digestive System

CB 41.21

CB 41.26

Different mouth and teeth structures can tell about an animal’s diet

CB 41.26

Different mouth and teeth structures can tell about an animal’s diet

Grizzly bear teeth

CB 41.27

Carnivores have a short digestive system

Herbivores have a long digestive system

CB 41.27

HumansBears

Both humans and grizzly bears are omnivores.Our digestive systems can tell us about our ancestors.

CB 41.15

What happens to the nutrients after absorbtion?

CB 42.5

Nutrients, Waste, O2, CO2, Water, Minerals, etc must be transported throughout the body

CB 42.5

Capillaries provide the large surface area required for these exchanges to take place.

In liver,nutrient levelsin blood areregulated

Fats and lipids move through the lymphatic system, whichreturns fluid to blooddirectly beforeheart

Lymphvessel

smallintestine

CB 41.24

CB 42.4

Different circulatory systems reflect evolution

CB 42.5

Mammals have two ciculatory circuits: pulmonary and systemic

CB42.9

Blood flows from arteries to capillaries to veins

CB 42.11

Blood pressure changes as the blood moves from arteries to capillaries

For W…