Lymphatic System

Nutrition-filled lymph drains from blood into the body tissues, into lymphatic tissues, then into the lymphatic system where it is filtered and returned to the bloodstream. It also plays a major role in the immune system, filtering out disease-causing organisms, producing specialized white blood cells and antibodies. Although joined to the cardiovascular system by a capillary system, the lymphatic system does not have a pump like the heart; this system relies on movement of the body to circulate fully.

Parts Involved

Functions

Fun Facts

Lymph nodes are most plentiful in the neck, armpits and the groin.

Chemicals in the eyes, stomach and mouth fluids fight infections.

Back to anatomical systems list

Muscular System

Muscles are responsible for every movement and all traveling that occurs within, all managed through coordination and pulling. There are about 700 muscles in the human body, about 600 of which are skeletal.

Parts Involved

Functions

Fun Facts

Muscles are efficient at turning fuel into motion, they are long-lasting, they are self-healing and they are able to grow stronger with practice.

Lactic acid is produced when too little oxygen reaches the muscle.

Eyes are the busiest muscles in the body with movements estimated at 100,000 per day.

Back to anatomical systems list

Nervous System

Made up of your brain, your spinal chord, and a 47 mile network of nerves that thread through your body, the nervous system is the communication center for coordinating actions and reactions. Using chemistry, electricity and bundles of sensory cells (neurons), messages are rapidly delivered to and from your central nervous system.

When a nerve is stimulated, an electrical impulse is created, and travels down the finger of the neuron. At the end of the neuron, the impulse triggers chemicals to assist the impulse in jumping to the next neuron. This process repeats until the message is delivered, and occurs far faster than it took you to read this. Neurons can be very tiny, three feet long, and everything in between.

The somatic nervous system processes voluntary motor actions and the autonomic nervous system controls the actions that we do not willfully control. The autonomic nervous system is divided into the sympathetic and the parasympathetic subsystems, which work in tandem like our government’s branches of checks and balances (sometimes there’s a team and sometimes it’s gridlock). To learn more about the autonomic subsystems, peruse Neurology.

Parts Involved

Functions

Fun Facts

While some endocrine responses take hours, nerve impulses travel as fast as 250 miles per hour!

The human body has 47 miles of nerve pathways.

Back to anatomical systems list

Reproductive System

The reproductive system perpetuates our species by fusing two cells from different genders introduced through sexual intercourse or artificial insemination. Both genders create, ripen, store and transfer their respective sex cells (called gametes). Gametes in both sexes are created in a process called meiosis.

When gametes combine successfully, the merged sperm and ovum form a zygote; 7-10 days later, the still dividing and growing formation implants in the uterus and becomes an embryo. About eight weeks later, the embryo has developed into a fetus, which continues to develop into an infant, born after nine months of gestation.

Male Parts Involved

Female Parts Involved

Fun Facts

According to the Guinness Book of World's Records, in the 18th century, a Russian peasant gave birth to 69 children over 40 years. Amongst them were 16 pairs of twins, 7 sets of triplets and 4 sets of quadruplets.

If an egg is not fertilized within 12-24 hours of being released from the follicle, it dissolves.

The clitoris is the only organ in humans seemingly designed purely for pleasure. It has twice the nerve endings of the entire penis.

Infant girls are born with 30,000 oocytes present in their ovaries! After reaching puberty, males typically produce 12 billion sperm per month!

Learn about research on how the male ‘pill’ may work.

Back to anatomical systems list

Be in touch with your body.

Sessions by appointment @ Guerrero Street studio, 10:30 - 8pm
walk- ins 1st/3rd Saturdays @ SoCha, 2-5pm

email 415-573-7476 San Francisco, USA

Sensory Revolution [http://sensoryrevolution.com] 2002-2008