Loading

Module 1: Módulo 3: Introdução ao sistema digestivo humano

Nota de Estudos
Study Reminders
Support
Text Version

O Ciclo de Energia

Set your study reminders

We will email you at these times to remind you to study.
  • Monday

    -

    7am

    +

    Tuesday

    -

    7am

    +

    Wednesday

    -

    7am

    +

    Thursday

    -

    7am

    +

    Friday

    -

    7am

    +

    Saturday

    -

    7am

    +

    Sunday

    -

    7am

    +

The ultimate source of all energy for living things on Earth
is the Sun.

This energy reaches the Earth in the form of solar radiation.

Page 2 Photosynthesis
Graphic - Leaf photosyn.jpg
The energy from solar radiation is stored by plants in the chemical bonds of glucose molecules.

The process for doing this is called photosynthesis.

PHOTO = light
SYNTHESIS = put together

Page 3 Photosynthesis
Graphic - Leaf photosyn.jpg

Photosynthesis takes place in the presence of the green substance called chlorophyll.

This is the chemical reaction for photosynthesis.

6CO2 + 6H2O + E => C6H12O6 + 6O2

Carbon Dioxide + Water + Energy YIELDS Glucose + Oxygen

Page 4 Food Consumption
The green plants are then utilized as food by various animals.

Ultimately, either the green plants or the animals that ate the green plants are consumed by humans.

Digestion and Metabolic Oxidation
Through the processes of digestion, the glucose is released.

It is then delivered to the cells of the body by the circulatory system.

Within the cells of the body, the energy is released from the glucose by the chemical process known as metabolic oxidation:

C6H12O6 + 6O2 => 6CO2 + 6H2O + E
Glucose + Oxygen YIELDS Carbon Dioxide + Water + Energy

Page 5 Production and Use of ATP
The released energy is then used to produce the compound known as ATP (adenosine triphosphate).

This metabolic oxidation and the production of ATP occur in the mitochondria.

For this reason, the mitochondria are known as the "powerhouses" of the cell.

When energy is required for carrying on any of the life processes, it is obtained from the ATP.

ATP => ADP + P04 + E
Yields

ATP