90% water and 10% solutes such as                     endocrine regulation - that enable us to
   proteins, cellular waste products, dissolved          survive.
   gases, and hormones.                                 The human skeleton can be divided into
  It may also contain bacterial cells that are          the axial skeleton (80 bones = 28 in skull
   picked up from diseased tissues and the               + 52 in torso) and the appendicular
   white blood cells that fight these                    skeleton (126 bones = (32 x 2 in upper
   pathogens.                                            extremities including both arms + 31 x 2
                                                         in lower extremities including both legs).
Blood Pressure
  It is the pressure exerted by circulating
   blood upon the walls of blood vessels.
  It is also known as arterial blood pressure.
  It is usually expressed in terms of the
   systolic (maximum) pressure over
   diastolic (minimum) pressure and is
   measured in millimeters of mercury (mm
   Hg).
  Sphygmomanometer is the measurement
   device for Blood pressure.
  Normal resting blood pressure in an adult
   is approximately 120/80 mm Hg.
  Blood pressure that is low due to a disease
   state is called hypotension, and pressure
   that is consistently high is hypertension.
SKELETON SYSTEM
  The body is supported and its internal
   parts protected by a strong yet flexible
   framework of bones called the skeleton.
   These bones meet at joints, most of which
   allow movement between the bones they
   connect. As well as protection and
   movement, bones provide a store for the
   mineral calcium, which is vital to the
   working of nerves and muscles. They also
   contain bone marrow, which makes blood            Skull
   cells and stores fat.
  The adult human skeletal system consists             It is composed of 22 bones that are fused
   of 206 bones, as well as a network of                 together except for the mandible.
   tendons, ligaments and cartilage that                The bones of the superior portion of the
   connects them. Babies have over 270, but              skull are known as the cranium and
   by adulthood many of these have fused                 protect the brain from damage.
   together.                                            The bones of the inferior and anterior
  The skeletal system performs vital                    portion of the skull are known as facial
   functions - support, movement, protection,            bones and support the eyes, nose, and
   blood cell production, calcium storage and            mouth.
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