Human Body Systems

Muscular System

Functions:

Helps you move

Provides stability (balance)

Protects body & organs

Regulates body temperature

Major parts/organs:

Skeletal muscles

Smooth muscles

Cardiac muscles

Muscular System

Interactions: Works with bones to help you move

Works with digestive system organs to help move food along

Works with circulatory system to help heart pump blood

Maintaining Homeostasis: Helps regulate body temp. (shivering)

Pumping heart faster when more oxygen is needed

Skeletal System

Functions:

Provides support

Helps you move

Protects internal organs

Produces blood cells & stores fat & calcium

Major parts/organs:

Compact & spongy bone tissue

Bone marrow

Cartilage

Skeletal System

Interactions:

Works with muscles to help you move

Supplies blood cells for circulatory system

Maintaining Homeostasis:

Supplies calcium to your nerves, muscles, and heart

Digestive System

Functions:

Ingesting food (eating)

Digesting food – breaking it down into nutrients

Absorbing nutrients

Getting rid of wastes

Major parts/organs:

Mouth, esophagus, stomach, small intestines, large intestines

Digestive System

Interactions:

Works with muscular system to move food through the body

Works with the excretory system to get rid of wastes

Maintaining Homeostasis:

Provides nutrients that are carried by the circulatory system (blood) throughout the body, which provides energy

Excretory System

Functions:

Collecting & eliminating wastes

Regulating the level of fluid in the body

Major parts/organs:

Kidneys

Ureters

Urethra

Bladder

Excretory System

Interactions:

Works with nervous system to regulate fluid levels in body

Works with digestive system to get rid of wastes

Works with circulatory system to regulate blood pressure

Maintaining Homeostasis:

Filters waste from the blood

Removes wastes from digestive system

Respiratory System

Functions:

Taking in oxygen

Eliminating carbon dioxide

Major parts/organs:

Pharynx

Larynx & trachea

Bronchi & lungs

Alveoli

Respiratory System

Interactions:

Works with muscular system to help you breathe

Maintaining Homeostasis:

Works with circulatory system to bring oxygen to cells & get rid of carbon dioxide

Circulatory System

Functions:

Carries food, water, oxygen, & other materials to your body’s cells

Carries away waste materials

Major parts/organs:

Heart

Blood vessels: arteries, veins, capillaries

Circulatory System

Interactions:

Works with respiratory system to transport oxygen to cells

Works with digestive system to transport nutrients

Transports hormones from the endocrine system

Maintaining Homeostasis:

Works with nervous system to regulate heartbeat

Lymphatic System

Functions:

Absorbs tissue fluid from around cells

Absorbs fats & transports them to blood (circulatory system)

Filters dead cells, viruses, bacteria, & other unneeded particles

Helps fight off illness & infections

Major parts/organs:

Lymph, lymph vessels, lymph nodes

Bone marrow, thymus, spleen, tonsils

Lymphatic System

Interactions:

Works with circulatory system to clean fluids & replace them in the bloodstream

Works with digestive system to absorb & transport fats

Maintaining Homeostasis:

Helps regulate fluid buildup around cells

Nervous System

Functions:

Gathers information from senses

Responds to stimuli (change in internal or external environment)

Maintains homeostasis

Major parts/organs:

Neurons (nerve cells)

Central nervous system: brain & spinal cord

Peripheral nervous system

Nervous System

Interactions:

Works with muscles to move

Works with circulatory system to regulate heartbeat

Works with respiratory system to breathe

Maintaining Homeostasis:

Senses changes in environment & responds by sending signals to other systems

Reproductive System

Functions:

Male: produce sperm cells

Female: produce egg cells & to nourish & protect the developing human (fetus)

Major parts/organs:

Male: testis, penis, sperm

Female: ovary, egg, vagina, uterus

Reproductive System

Interactions:

Works with endocrine system to control menstrual cycle, sperm production, and childbirth

Maintaining Homeostasis:

Does not help the body to maintain homeostasis