The human body Systems Άτομο Οργανισμός Σύστημα οργάνων Μόριο Μακρομόριο Όργανο Οργανίδιο Κύτταρο Οργανισμός Ιστός Cell diagram Cells are the basic building blocks of all living things. The human body is composed of trillions of cells. They provide structure for the body, take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Cells also contain the body’s hereditary material and can make copies of themselves. Cells have many parts, each with a different function. Some of these parts, called organelles, are specialized structures that perform certain tasks within the cell. The cell is the smallest functional body unit capable of life processes. Human cells contain the following major parts The plasma membrane is the outer covering around the cell. The nucleus contains most of the cell’s genetic material. It also houses DNA, the cell’s hereditary material. The cytoplasm surrounds the cell’s nucleus and organelles. The endoplasmic reticulum is involved in molecule processing and transport. The Golgi apparatus is involved in packaging molecules for export from the cell. Lysosomes and peroxisomes destroy toxic substances and recycle worn-out cell parts. Mitochondria provide the cell’s energyand can make copies of themselves.. Ribosomes use the cell’s genetic instructions to make proteins. DNA (Deoxyribonucleic acid)- "ντι εν έι" δε(σ)οξυριβο(ζο)νουκλεϊ(νι)κό οξύ The nucleus (πυρήνας) of each cell (except red blood cells, eggs, and sperm) contains 46 chromosomes, which are coiled molecules (κουλουριασμένα μόρια) of DNA. Genes are tiny regions of DNA that dictate cell activity and inherited traits (γνωρίσματα). Human cells Tissue • Collections of cells make up tissues. • Each body tissue has a distinct function. Organ • A tissue is an ensemble of similar cells from the same origin that together carry out a specific function. • Organs are then formed by the functional grouping together of multiple tissues. • An organ consists of 2 or more tissues that perform a particular function (e.g., heart, liver, stomach, and so on). Nervous system The Human Body with all systems • The body consists of several integrated systems. These systems are organs and tissues that work together to carry out a specific body function, such as digestion. The different types of tissue that make up organs and other body parts are specialized. • The interconnected cells that make up these tissues each contain genes that programme cell activities. • Each major body system has a particular function. • In a healthy body, all the systems work efficiently and in synchrony so that we are able to live and reproduce. All body systems are controlled by the nervous system, the control centre of which is the brain . Endocrine system It has organs, such as the thyroid gland, and tissues that produce hormones to regulate body functions. Respiratory system Cardiovascular system καρδιαγγειακό The heart pumps blood containing oxygen and nutrients through a network of vessels to all parts of the body . The key organs in this system are the lungs; They absorb oxygen from the air and release carbon dioxide (CO2). Muscular system Digestive system Muscles are able to contract and relax to carry out body movements. It processes nutrients as they pass through the stomach and intestines and eliminates waste. Urinary system Reproductive system The kidneys and bladder control urine to maintain water and chemical balance. Male: the tests produce testosterone. They control the development of sperm and physical characteristics in men such as facial hair and a deep voice. Female: The ovaries produce estrogen/ oestrogen and eggs. Skin Skin protects internal organs and helps to control body temperature. Lymphatic and immune system A network of lymph vessels and nodes work with blood and bone marrow to protect the body from diseases. Skeletal system The bones protect internal organs and support the body. Βιβλιογραφία • https://el.wikipedia.org • https://en.wikipedia.org • http://www.aviva.co.uk/medical-encyclopedia/entry/the-humanbody/ • http://ghr.nlm.nih.gov/handbook/basics/cell, Genetics Home Reference, US Library of Medicine • http://dreamstime.com/z/human-body-cells • www.okaidimalta.com