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Human Body Systems. How many human body systems are there?. Digestive Reproductive Respiratory Nervous Excretory Endocrine Circulatory Skeletal Muscular. Nutrition.

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how many human body systems are there
How many human body systems are there?
  • Digestive Reproductive
  • Respiratory Nervous
  • Excretory Endocrine
  • Circulatory
  • Skeletal
  • Muscular
  • Nutrients  are substances in food that provide raw materials and energy the body needs to carry out all essential processes.
    • There are six kinds of nutrients: carbohydrates, fats, proteins, vitamins, minerals, and water.
  • Example  Sugar and Starches
  • Function  main source of energy of life processes
  • Nutrient  Fat
  • Example  oils, butter, cream
  • Functions  A reserve energy supply, building material for certain cell structures
  • Example  Meat, eggs, beans, milk, fish
  • Functions supplies amino acids which make new cells and body chemicals, repair and maintains body tissues
  • Example  A, B, C, D, K
  • Functions  Necessary for good health and a healthy body, lack of a vitamin can cause disease
  • Example  Calcium, iron, potassium
  • Functions  Regulate body functions, needed for structure of body parts, maintain good health
  • Functions  Dissolves and transports materials in the body which is 70% water, needed for chemical reactions in the body
digestive system
Digestive System
  • Is responsible for breaking down food into molecules the body can use.
  • Then the molecules are absorbed into the blood and carried throughout the body.
  • Finally, wastes are eliminated from the body
digestive system1
Digestive System
  • There are several parts:
    • Mouth Pancreas
    • Esophagus Large Intestine
    • Stomach
    • Small Intestine
    • Liver
mouth salivary glands
Mouth & Salivary Glands
  • Function: Physical and Chemical breakdown of food
  • Physical when your teeth are breaking down the food
  • Chemical the breakdown of complex molecules into simple (by enzymesAmylase)
  • Connects the mouth to the stomach
  • Epiglottis seals off your windpipe, preventing the food from entering.
  • Peristalsis waves of muscle contractions- pushes food through the to the stomach
  • J- shaped, muscular pouch
  • Pepsin & Protease enzyme digests proteins
  • Hydrochloric Acid  strong acid helps protease, kills bacteria
  • Mucus  coats and protects the lining of the stomach
small intestines
Small Intestines
  • Completes chemical digestion, food is absorbed and transported to cells by blood.
  • Produces protease, amylase, lipase enzymes
  • Long & folded increase surface area. Tiny finger-like=villi cover inner surface increase surface area.

Produces chemicals needed for digestion

Liver breaks down medicines & produces bile

Bile breaks down fat particles & neutralizes stomach acid

  • Triangular shaped organ, between stomach and small intestines
  • Produces enzymes (protease, amylase, lipase) that flow into the small intestines
large intestines
Large Intestines
  • 1 ½ meters long (as long as a bathtub)
  • Absorbs excess water, collects undigested food for removal from body
rectum anus
Rectum & Anus
  • Rectum short tube where waste is compressed into solid form
  • Anus  waste material is eliminated from the body