Cardiovascular
System
It is
important to learn about how your body works. A good place to start is
with your heart, blood, and blood vessels. Why? Because these are the components
that move the substances your body makes to where they are required. |
Circulatory
System
The
blood is the transport system by which oxygen and nutrients reach the body's
cells, and waste materials are carried away. |
THE
CIRCULATORY SYSTEM
The
CIRCULATORY SYSTEM includes the heart, blood, and blood vessels (tubes).
The main role of this system is to take oxygen and nutrients to, and pick
up waste from, the cells. |
The
Life Pump. |
It's
strong. It's lean. It's a pumping machine! All About the Heart
Your
heart is really a muscle. It's located a little to the left of the middle
of your chest, and it's about the size of your fist. There are lots of
muscles all over your body - in your arms, in your legs, in your back,
even in your behind. |
Sizing
Up: The Development of the Human Heart
A human
being's heart is about the size of that human being's fist. As the body
develops, the heart grows at the same rate as the fist. So an infant's
heart and fist are about the same size at birth. |
Structure
of the Human Heart
The
heart you see drawn on the average Valentine is only a rough representation
of the actual structure of the heart. Your heart is actually shaped more
like an upside-down pear. |
The
Heart
The
heart is a pumping system which intakes deoxygenated blood through the
veins, delivering it to the lungs for oxygenation and then pumping it into
the various arteries to be transmitted to where it is needed throughout
the body for energy. |
The
Life Pump
Science
Factfile
Red
blood cells carry oxygen from the lungs to all the cells of the body. |
The
Human Circulatory System and the Heart |
Cut-away
of Human Heart |
Heart
Quiz |
Blood
In this
section you will learn about the circulatory system, which is responsible
for transporting bloods throughout the body. This system provides a way
for glucoses, oxygen and hormones to reach various organs around the body. |
Blood
The
average adult has about five liters of blood living inside of their body,
coursing through their vessels, delivering essential elements, and removing
harmful wastes. Without blood, the human body would stop working. |
Circulatory
System from Thinkquest |
Blood
Vessels
Blood
vessels in the dermis supply nutrients to the deep living layers of the
epidermis, as well as to dermis cells. These vessels also play an important
role in the regulation of body temperature. |
Your
Digestive System and How it Works
The
digestive system is a series of hollow organs joined in a long, twisting
tube from the mouth to the anus (see figure). Inside this tube is a lining
called the mucosa. In the mouth, stomach, and small intestine, the mucosa
contains tiny glands that produce juices to help digest food. |
The
Digestive System from Thinkquest |
The
Food Factory
When
you eat, your body digests the food so your cells can use it to make energy. |
The
Digestive System
The
digestive system prepares food for use by hundreds of millions of body
cells. |
Your
Digestive System and How It Works
The
digestive system is responsible for the digestion, absorption, and assimilation
of fluids, macro- and micro-nutrients (vitamins and minerals) and the elimination
of waste from the gastrointestinal tract. |
Digestive
System
This
illustration shows the major organs of the digestive system. Their relative
sizes and positioning in the body are also demonstrated. |
The
Digestive System
The
human body needs fuel to live. We eat food for fuel. But just getting the
food into the body is only a small part of the process. |
How
your Digestive System Works
The
digestive system is a series of hollow organs joined in a long, twisting
tube from the mouth to the anus. Inside this tube is a lining called the
mucosa. In the mouth, stomach, and small intestine, the mucosa contains
tiny glands that produce juices to help digest food. |
Digestive
System
Food
provides us with fuel to live, energy to work and play and the raw materials
to build new cells. All the different varieties of food we eat are broken
down by our digestive system and transported to every part of our body
by our circulatory system. |
DIGESTIVE
SYSTEM
In a
nutshell, the digestive system is that which accepts food, breaks it down
into nutrient components, which then enter the bloodstream, and any indigestible
leftovers are eliminated. |
|
The
Digestive System
The
Digestive system plays a very important role in the functioning of the
human body in that it regulates the energy break down for the cells of
the body. Without the digestive system, the cells of the body would not
be able to obtain the energy needed for proper functioning. |
Pulmonary
Vein
When
the muscular wall of the right ventricle contacts, the blood inside the
heart chamber is put under more pressure, and the tricuspid valve closes. |
Tutorial
This tutorial on the nervous system starts
with the brain and goes through other organs of the nervous system. The
diagrams are well done and will make a good addition to a project. Remember
to give the authors credit! |
The
Nervous System
The nervous system of the human being is
responsible for sending, receiving, and processing nerve impulses throughout
the body. All the organs and muscles inside your body rely upon these nerve
impulses to function. It could be considered as the master control unit
inside your body. |
Brain
The brain is a jelly-like substance, which
in adults weighs about three pounds. It is divided into three parts: the
brain stem, which is an extension of the spinal cord, the forebrain (which
consists mainly of the cerebruim) and the cerebellum. |
Brain
Disorders and Diseases
The Dana Alliance for Brain Initiatives,
an independent non-profit organization of more than 175 pre-eminent neuroscientists,
including 6 Nobel Laureates, recommends the Internet sites reviewed below
as helpful resources for people concerned about brain diseases and disorders. |
The
Control Center
Thinkquest
on Nervous system |
How
Your Immune System Works
Inside
your body there is an amazing protection mechanism called the immune system.
It is designed to defend you against millions of bacteria, microbes, viruses,
toxins and parasites that would love to invade your body. |
How
Does the Immune System Work?
The
immune system response process begins when a foreign invader enters the
body (perhaps a cold virus or bacterium from an injury). To your body,
this invader is an antigen and must be eliminated. |
The
Eye
The eyes are the two organs of sight. They
are located in the front upper part of the skull and consist of structures
that focus an image onto the retina at the back of the eye which is a network
of nerves that convert this image into electrical impulses to be recorded
in a region of the brain |
Eyes
Welcome to the Eye Site, your one
stop source of information about eyes. Whether you just want to know
basic information about the eye,or if you want to go deeper and learn how
everything works, this is the site for you! |
Optic
Nerves
The "optic nerves" are the second pair of
the cranial nerves, and lead from the eyes to the brain. The sensory cell
bodies of the nerve fibers occur in "ganglia" within the eyes. |
The
Ear
The ear is an organ for hearing and balance.
It consists of three parts: the outer ear, the middle ear, and the inner
ear. The outer and middle ear mostly collect and transmit sound. |
Seeing,
hearing and smelling |
Skin
Skin is the outside covering of body tissue,
which protects inner cells and organs from the outside environment. The
skin is the largest organ of the body, and its cells are continuously replaced
as they are lost to normal wear and tear. |
Smell:
The Nasal Passage
Smell is often considered to be the least
important of all the senses, but it may be one of the oldest, and probably
acts on the subconscious more than the other senses. |
Tongue
Anchored to the floor of the mouth and slung
at the rear from muscles attached to a spiky outgrowth at the base of the
skull, the tongue is a strong muscle that is covered by the lingual membrane,
which has special areas which detect the flavor of food. |
The
Senses - a thinkquest entry |
Please contact eweiner
for
suggestions. |
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