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Human body systems
Eleven Organ Systems
Each organ system has its own
function in the body
• Nervous
• Integumentary
• Respiratory
• Digestive
• Excretory
• Skeletal
• Muscular
• Circulatory
• Endocrine
• Reproductive
• Lymphatic/ immune
Nervous system
• Organs: Brain, Spinal
cord, peripheral nerves
• Function: Recognize
& coordinates the
body’s response to
changes in its
environment
Integumentary
• Organs: Skin, hair, nails, sweet & oil glands
• Function: Serves as a barrier against
infection & injury, helps regulate body
temperature
Respiratory system
• Organs: nose,
pharynx, larynx,
trachea, bronchi,
bronchioles, lungs
• Function: Provide
oxygen & remove
carbon dioxide
Digestive system
• Organs: Mouth,
pharynx, esophagus,
stomach, small & large
intestines, rectum
• Function: Converts
food into simple
molecules, absorbers
food, eliminates waste
Excretory
• Organs: skin,
lungs, kidneys,
ureters, urinary
bladder, urethra
• Function:
eliminates waste,
toxins from the
body
Skeletal
• Organs: bones,
cartilage,
ligaments,
tendons
• Function: support
the body, protects
internal organs,
blood cell
formation
Muscular system
• Organs: skeletal
muscles, smooth
muscles, cardiac
muscles
• Function: works with
skeletal system to
produce voluntary
movement, helps to
circulate blood & move
food through the
digestive system
Circulatory
• Organs: Heart, blood
vessels, blood
• Function: bring
oxygen, nutrients, and
hormones to cells, fight
infection, remove cell
waste, regulates
temperature
Endocrine
Organs: Hypothalamus,
pituitary, thyroid,
parathyroid, adrenals,
pancreases, ovaries
(female), testes (male)
Function: controls
growth, development,
and metabolism,
maintains homeostasis
Reproductive
• Organs: male testes, epididymis,
vas deferens,
urethra, penis.
Female – ovaries,
fallopian tubes,
uterus, vagina
• Function: produce
reproductive cells.
In females nurtures
& protects embryo
Lymphatic/ immune
• Organs: white blood
cells, thymus, spleen,
lymph nodes, lymph
vessels
• Function: helps
protect body from
disease, collects fluid
lost from blood vessels
& returns it to
circulatory system
Feedback Loops
• The body must self
moderate – Maintain
homeostasis.
• Two types of
feedback loops:
– Negative
– Positive
• Negative feedback
counteracts condition
• Positive feedback
amplifies condition
• Negative more
common.
Pair share: Can you think of a body function
that might require a feed back loop?
Negative Feedback
•
Prevents body
from moving away
from a set point
significantly.
• Allows body to
self-correct.
• Ex: controlling
tempurature
Negative Feedback Loop
Positive Feedback
• Accentuates
disturbance.
• Examples:
– Blood clotting
– Nursing a baby causes
production of milk
• Closely regulated by
negative feedback
loops.
Positive Feedback Loop
Review
1. What system is the
heart a part of?
2. Which system is the
brain a part of?
3. What does the
excretory system
do?
4. Name 2 sets of
systems that are
closely associated
with each other.