Human body systems

Nervous Integumentary Respiratory Digestive Excretory Skeletal 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 What system is the heart a part of? Which system is the brain a part of? What does the excretory system do? Name 2 sets of systems that are closely associated with each other.