The human body has three vital functions: nutrition, interaction, and reproduction. The document focuses on the nutrition and interaction functions. It describes the major organ systems involved in nutrition - digestive, respiratory, circulatory, and excretory. These systems work to break down food, absorb oxygen, transport blood, and eliminate waste. Healthy habits like eating well, exercise, and hygiene also support nutrition. The interaction function involves stimuli that trigger responses. There are external stimuli from the environment captured by the senses and internal stimuli from changes inside the body detected by receptor organs. Both types of stimuli generate sensations that are processed by the brain, leading to motor or glandular responses.

1. The human body and interaction
José Ángel

2. The three vital functions
Exist three functions:
-Nutrition
-Interaction
-Reproduction
The human body and nutrition:
-The digestive system:
Breaks down the food into molecules
the body absorb. The stomach and
the intestines are there organs.

3. -The respiratory system:
Absorbs oxygen to the body.
The lungs and the trachea are
the organs.
-The circulatory system:
Transport blood all over the body.
The heart is the organ.
-The excretory system:
Eliminates the waste of our body
produce. The kidneys is the organ.
-Healthy habits:
Eat, exercise, keep clean, have a good posture, spend time with the family
and friends.

4. The interaction function
Types of Stimuli
-External Stimuli:
Are the changes that happen in our enviroment outside the body. Our sense
capture these stimuli and send a message to the brain.
-Internal Stimuli:
Are the changes inside our body. The receptor organs receive these stimuli.
Send message to the brain.

5. 1. Stimulus-sensation 2.Processing information
A stimulus is any action or change The body sends information of
in our environment. the sensation to the brain.

6. 3. Response
The order becomes a response to the stimuli
and say to the body.
Types of responses
Motor responses: Gladular responses:
Happen when muscles move. Happen when organs called
glands produce a substance.