The document discusses the key body systems involved in the three vital functions of nutrition, interaction, and reproduction in humans. It describes the digestive, respiratory, circulatory, and excretory systems that work together to enable nutrition. It then explains how the sensory and nervous systems, including the five senses, allow for the interaction function by detecting internal and external stimuli and sending messages to the brain to coordinate responses through the musculoskeletal system.

1. Alejandra López García
Rosario Bernal

2.  THE THREE VITAL FUNCTIONS
 THE INTERACTION FUNCTION
 THE SENSORY SISTEM
 THE NERVOUS SYSTEM
 THE MUSCULOSKELETAL SYSTEM

3.  All living things have one thing in common: they
can carry out the three vital functions if nutrition,
interaction and reproducton
 The human body and nutrition
 We need nutrition in order to keep our bodies
working. The digestive system, the repiratory
sistem, the circulatory system and excretory
system.

4. The digestive system
The digestive system
breaks down the food we
eat into smaller molecules
that our body can absorb.
The stomach and the
intestines are organs of the
digestive system.
The respiratory system
The respiratory system
absorbs oxygen into the
body and releases carbon
dioxide. The lungs and the
trachea are organs of the
respiratory.
The circulatory system
The circulatory system
transports blood all over the
body. The heart is an organ
of the circulatory system.
The excretory system
The excretory system
eliminates the waste our
body produces. The
kidneys are organs of the
excretory system.

5.  Human beings are able to control and coordinate
activities throught the interaction function. It
enables living things to recive information either
from the enviroment or from their own body
through the sense organs and respond to it.

6.  EXTERNAL EXTIMULI:
 Are changes that happen in our enviroment inside the body. Our
sense organs capture these stimuli and send a message to the
brain. The ears are sense organ. When they hear a loud noise,
they send a message to the brain. The brain tells us to turn into
the unexpected noise.
 INTERNAL STIMULI:
 Are changes that happen inside our body. Receptor organs
inside our body recive these stimuli. Then, they send a message
to the brain. The stomach is a receptive organ because it takes
in food. When it is empty, it tells the brain we are hungry. The
brain tells us to eat food

7.  STIMULUS-SENSATION:
 A estimulus is any action or change in our
enviroment that we can feel.
 PROCESSING INFORMATION:
 The body sends information about the sensation
to the bran, and the brain decides
 RESPONSE:
 En order becomes and response to the stimuli and
an action thet tells the body what to do

8.  MOTOR:
 Happen when the musches move
 GLANDULAR:
 Happen when organs called glands produce a
substance

9.  Five senses:
 The sense of smell: nasal cavity and pituitary
 The sense of taste: Tongue, taste buds and
flavours
 The sense of touch: touch receptors
 The sense of sight: eyes, pupil, lens, retina and
optic nerve
 The sense of hearing: outer ear, iner ear, midle
ear, cochlea and auditory nerve.

10.  SENSE ORGANS They respond to a stimulus and send impulses along the
sensory nerves
 SENSORY NERVES They can carry information from the sense organ and inernal
organs to the central nervous system
 CENTRAL NERVOUS SYSTEM It recives and interprets information and produces
responses. It is made up of the spinal cord and the brain.
 SPINALD CORD Produces fast and automatic responses.
 BRAIN Is inside the cranium and it makes decisions and gives orders.
 MOTOR NERVES The central nervous system coordinates the information
received and sends impulses along motor nerves. These motor nerves carry signals
from the central nervous system to the muscles in the musculoskeletal system.
 THE BRAIN has three parts: the cerebellum, the brain stem an the cerebrum
 The cerebellum: controls balance and coordination
 The brain stem: controls organs functions
 The cerebrum: Produces voluntary and involuntary responses