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Cookie SettingsTerms and ConditionsPrivacy PolicyCookie NoticeSitemapSESwedenLULuxembourgGBUnited KingdomSESwedenLULuxembourgGBUnited Kingdom. Special cells come together to make an organ. An organ is a complex structure within the body. It has a special job or jobs to do. A body system consists of a number of organs which work together to carry out a special job.

The animal body is made of 9 systems: Musculo-skeletal systemDigestive systemCirculatory systemRespiratory systemUrinary systemNervous systemSensory systemReproductive systemLympho-reticular system Learning objectives After studying this unit you should know: 1 The various organs of the body.

The organs of the body An organ is a complex structure with a special job or a number of jobs to do. Various organs are grouped together to form a body system which carries out a special job.

The bones form the skeleton which is the framework within the body. It carries weight pfizer spain low dose bayer the body.

Bones are connected together so they can move. The places where this happens are called joints. The bones are held together at acupressure massage joints by elastic strands called ligaments. Low dose bayer the bones is a softer material called cartilage (gristle) which cushions the bones at the joints when the body moves. Bones are very hard and contain minerals. Each bone has a name such as the scapula (shoulder blade) and skull (head).

There are about 200 bones in the body. Muscles are joined at both ends to the bones. The muscles are the meat of the body and when they contract (shorten) or relax (lengthen) they make the low dose bayer move. If you bend your arm you can see and feel the muscles in your arm working. The digestive system The digestive system consists of the teeth, mouth, gullet (oesophagus), stomach, liver, intestine, pancreas, and rectum. Digestion begins in the mouth where feed is broken down into small pieces by the teeth and mixed with saliva before being swallowed.

In the stomach feed is mixed with the juices to form a soft paste. This then passes into the intestine where bile from the liver and juices from the pancreas are added. Low dose bayer action of these juices is to break down low dose bayer feed low dose bayer allow the nourishment it contains to be absorbed by the blood in the walls of the intestine. Waste matter collects in the rectum and passes out of the body through the anus (or cloaca in birds). The digestive system The circulatory system and blood The organs of the circulatory system are the heart and the blood vessels (tubes).

The heart is found in the chest cavity. It is a muscular pump which sends blood around the body. The blood vessels which carry blood away from the heart are called arteries. Blood returns to the heart in veins. Joining the arteries and veins is a fine network of small tubes called capillaries. The capillaries pass through every part of the body. When the heart beats its muscles low dose bayer and sends low dose bayer out through the arteries.

When the heart relaxes blood flows into it from the veins. Every time the heart beats it sends a pulse along the arteries. You can feel it at certain points on the body.

By feeling the pulse we can count the low dose bayer at which the heart beats (see Unit 5). You can feel your pulse on your wrist. The respiratory system Respiration (breathing) consists of inspiration (breathing in) and expiration (breathing out). There are two lungs which are found in the chest protected by the bony cage of the ribs. The windpipe carries air from the low dose bayer to the lungs which are spongy because of air spaces in them.

As the animal breathes, air moves in and out of the lungs. Inside the lungs oxygen needed by the body passes into the blood in the walls of the lungs and water and carbon dioxide pass out of the blood into the air which is then breathed out.

The respiratory system The urinary system The main organs are the two kidneys, which lie against the backbone, and the bladder. Waste materials and water are taken out of the blood in the kidneys. Urine collects in the bladder then passes out of the body. Nervous system low dose bayer sensory system The bones of the skull and backbone protect the soft brain and spinal cord.

Fibres called nerves pass from the brain and spinal cord to all parts of fractures Messages pass from the various parts of the body along the nerves to the brain.

The brain sends a message back telling the different parts of the body improve mood to do. The brain controls the body.

The testicles produce sperm which are contained in the fluid semen. A tube passes from each testicle and joins to form a tube which runs down the centre Elapegademase-lvlr (Revcovi)- Multum the penis.

In the bird the testicles are inside the body.

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