Circulatory System/Cardiovascular System: The circulatory system is an organ system that passes nutrients gases, hormones, blood cells, etc. to and from cells in the body to help fight diseases, stabilize body temperature and pH, and to maintain homeostasis. It is made up of the heart, blood and blood vessels.
Integumentary System: The integumentary system is the organ system that protects the body from damage, comprising the skin and its appendages(including hair, scales, feathers, and nails). The integumentary system has a variety of functions; it may serve to waterproof, cushion, and protect the deeper tissues, excrete wastes, and regulate temperature, and is the attachment site for sensory receptors to detect pain, sensation, pressure, and temperature. In most terrestrial vertebrates with significant exposure to sunlight, the integumentary system also provides for vitamin D synthesis. Respiratory System: The respiratory system is the anatomical system of an organism that introduces respiratory gases to the interior and performs gas exchange. In humans and other mammals, the anatomical features of the respiratory system include the pharynx, larynx, trachea, bronchi, lungs and diaphragm Endocrine System: The endocrine system is the system of glands, such as the hypothalamus, pituitary or pituitary gland, pineal body or pineal gland, thyroid, parathyroids and adrenals, i.e., adrenal glands, each of which secretes a type of hormone directly into the bloodstream to regulate the body. Hormones regulate various human functions, including metabolism, growth and development, tissue function, and mood. Muscular system: The muscular system is an organ system consisting of skeletal, smooth and cardiac muscles. It permits movement of the body, maintains posture, and circulates blood throughout the body. The muscular system in vertebrates is controlled through the nervous system, although some muscles (such as the cardiac muscle) can be completely autonomous....
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