The musculo skeletal system bones the human body has 206 bones fig 10 5 there are 4 types of bones leg bones are long bones bones in the joints a joint is the point at which 2 or more bones meet joints allow movement chapter 30 cartilage is muscles the human body has more than . The eye has three layers o the sclera the white of the eye is the outer layer it is made of tough connective tissue o the choroid is the second layer blood vessels the ciliary muscle and the iris make up the choroid the iris gives o the retina is the inner layer it has receptors for . The skeleton functions as a dense protective framework for the body which can shield internal organs in addition to forming a structure to which other tissues such as muscle can attach the skeleton also supports the weight of the body moreover most bones of the body contain red bone marrow inside their structure the red bone marrow is essential for the production of all blood cells. Today most primary sources offer a total of 11 body systems and functions described in brief detail below body systems and functions as you have probably already concluded the different human body systems have a vast array of overlapping and complementary functions the sympathetic and parasympathetic control of heart rate is an example of the nervous system function interacting with the
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