1. Anatomy is the study of the structure and shape of body and parts, while physiology is the study of how the body work and function, their relationship is seen for example in the heart, there are two valves (anatomy) and these two valves help the heart pump blood.
2. The atom is the smallest particle of an element. An example is carbon ( C ) which is the building block of life. A group of atoms could form for example, a water molecule (H2O ) which is two or more atoms joined together and these molecules if larger in size becomes macromolecules which are carbohydrates, lipids, proteins, nucleic acids and are also known as nutrients which are parts of the organelles such as a nucleus which are parts of cells with specific functions and they make up the cell and helps perform functions such as destroying harmful substances such as white blood cells. Other types of cells join together to form tissues, which perform a function such as epithelia for a larger organ such as skin. Another example is the nervous tissue for the brain. Organs make up organ systems such as the cardiovascular system for the heart, and an organ system is a group of organs which work collectively to carry out a process in the organism, which are made up of many organ systems which may be part of a larger population (such of as humans).
3. The eleven organ systems include the cardiovascular system, the digestive system, the endocrine system, the immune system, the integumentary system, lymphatic system, the musculoskeletal system, the nervous system, the respiratory system, the reproductive system, and the urinary system. The integumentary system is the largest system by mass, it forms the external body covering, protects deeper tissue and produces Vitamin D, as well as serves as the location of cutaneous nerve receptors. Its parts include skin. The skeletal system protects and supports body organs, provides muscle attachment for