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Anatomy & Physiology: Human Body Orientation and Homeostasis

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  • What is Anatomy?

    Anatomy is the study of the structure of the body and how its parts are arranged.

  • What are the subdivisions of Anatomy?

    Gross (macroscopic), Microscopic (cytology and histology), and Developmental (embryology).

  • What is Physiology?

    Physiology is the study of the function of the body and how its parts work.

  • What are the three main themes or concepts in Anatomy & Physiology?

    Complementarity of Structure and Function, Hierarchy of Organization, and Homeostasis.

  • Explain the Principle of Complementarity of Structure and Function.

    Function always reflects structure; what a structure can do depends on its specific form.

  • List the levels of structural organization from simplest to most complex.

    Chemical, Cellular, Tissue, Organ, Organ System, Organismal.

  • What are the necessary life functions?

    Maintaining boundaries, movement, responsiveness, digestion, metabolism, excretion, reproduction, and growth.

  • What is Homeostasis?

    Maintenance of relatively stable internal conditions despite continuous changes in the environment; a dynamic state of equilibrium.

  • What are the four components of a homeostatic control mechanism?

    Stimulus, Receptor, Control Center, and Effector.

  • Describe Negative Feedback.

    A response that reduces or shuts off the original stimulus to maintain homeostasis, e.g., regulation of body temperature.

  • Describe Positive Feedback.

    A response that enhances or exaggerates the original stimulus, usually controlling infrequent events like blood clotting or labor contractions.

  • What are the survival needs of the human body?

    Nutrients, oxygen, water, normal body temperature, and appropriate atmospheric pressure.

  • What is the function of the Integumentary system?

    Protects against environmental hazards, helps regulate body temperature, and provides sensory information.

  • What is the function of the Skeletal system?

    Provides support and protection, stores minerals, and forms blood cells.

  • What is the function of the Muscular system?

    Provides movement, protection, support, and generates heat to maintain body temperature.

  • What is the function of the Nervous system?

    Directs immediate responses to stimuli, coordinates activities of other organ systems, and provides sensory information.

  • What is the function of the Endocrine system?

    Directs long-term changes in other organ systems, adjusts metabolic activity, and controls development.

  • What is the function of the Cardiovascular system?

    Distributes blood cells, nutrients, oxygen, carbon dioxide, and heat throughout the body.

  • What is the function of the Lymphatic system?

    Defends against infection, returns tissue fluids to the bloodstream, and houses immune cells.

  • What is the function of the Respiratory system?

    Supplies oxygen to the blood, removes carbon dioxide, and produces sounds for communication.

  • What is the function of the Digestive system?

    Processes and digests food, absorbs nutrients and water, and stores energy reserves.

  • What is the function of the Urinary system?

    Eliminates nitrogenous wastes, controls water balance, stores urine, and regulates blood ion concentrations and pH.

  • What is the function of the Male Reproductive system?

    Produces male sex cells (sperm), suspending fluids, hormones, and facilitates sexual intercourse.

  • What is the function of the Female Reproductive system?

    Produces female sex cells (oocytes), supports embryo development, provides milk, and facilitates sexual intercourse.

  • How do organ systems interact to maintain life?

    Organ systems cooperate and depend on each other to meet the survival needs of cells and maintain homeostasis.

  • What role do the nervous and endocrine systems play in homeostasis?

    They communicate via nerve impulses and hormones to monitor and regulate body functions.

  • Give an example of negative feedback in the human body.

    Regulation of body temperature by the hypothalamus activating sweat glands and blood vessel dilation.

  • Give an example of positive feedback in the human body.

    Blood clotting where platelets release chemicals that attract more platelets to the injury site.