The Muscular System


The main function of the muscular system is movement. Muscles are the only tissue in the body that has the ability to contract and therefore move the other parts of the body. Related to the function of movement is the muscular system's second function: the maintenance of posture and body position.

some diseases for mucels

polymyositis, inflammation, dermatomyositis, and polymyositis are some diseases of  the muscular system.

5 fun facts

Muscles make up 40% of your weight.

total It takes half as long to gain muscle than it does to lose it.

The smallest muscles are found in the middle ear.

To take one step, you use 200 muscles.

Humans are born with all the muscle fibers they will ever have.

the skeletal system


The human skeleton is an amazing and complex structure and is involved in vital functions such as supporting the bodily organs, providing points of attachment for the musculature system to allow movement, maintaining body shape, and protecting vital organs such as the brain and spinal cord. In this free online human anatomy course you will learn about the structure, development and function of bones within the human skeletal system.

some diseases for bones

Low bone density and osteoporosis, which make your bones weak and more likely to breakOsteogenesis imperfecta makes your bones brittlePaget's disease of bone makes them weakBone disease can make bones easy to breakBones can also develop cancer and infectionsOther bone diseases are caused by poor nutrition, genetic factors or problems with the rate of bone growth or rebuilding

5 fun facts

At birth the human skeleton is made up of around 300 bones. By adulthood, some bones have fused together to end up with 206 bones.

Human bones grow continually from birth till our mid 20's. Our skeleton's bone mass is at its maximum density around the age of 30.

If broken our bones will re-grow and repair themselves. Often doctors will place a cast on splint to make sure these bones repair straight and true.

The axial skeleton part of the human skeleton has 80 bones. It includes the vertebral column, the rib cage and the skull and helps us maintain our upright posture, by spreading the weight in the head, and upper areas down to the lower areas near the hips.

The appendicular skeletal section of our skeleton has 126 bones. It includes the pectoral (shoulder) girdles, the pelvic girdle and the bones of the lower and upper limbs. Its function is for movement of the body and to protect some organs.

the excretory system


The excretory system is the system of an organism's body that performs the function of excretion, the bodily process of discharging wastes. The Excretory system is responsible for the elimination of wastes produced by homeostasis.

some diseases for excretory system

Kidney Stones- This disease is when uric acid form crystals that bundle up in the kidneys, this prevents the kidneys to function correctly and causes the host pain. The 2 cures are to let the stones "pass" through or by surgery.

Urethritis- This disease is an inflammation of the urethra caused by bacterial/viral infection. Treatment of Urethritis are anti-viral/pain mediction.

Pyelonephritis- This is a type of urinary tract infection that travels from the urethra to the kidneys. There are only medication that can help calm down the infection.

5 fun facts

Skin is not part of the excretory system

Bladder cancer forms when cells lining the urinary bladder are abnormal

Kidney stones can move through your body

Kidney cancer forms when cells in the tissues in the kidney are abnormal

Kidney stones can be the size of a golf ball

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