Varicose Veins: is the circulatory system made up of the heart veins arteries and capillaries?

is the circulatory system made up of the heart veins arteries and capillaries?
I need to know :( plz help!

The circulatory system is an organ system that passes nutrients (such as amino acids and electrolytes), gases, hormones, blood cells, etc. to and from cells in the body to help fight diseases and help stabilize body temperature and pH to maintain homeostasis.

This system may be seen strictly as a blood distribution network, but some consider the circulatory system as composed of the cardiovascular system, which distributes blood,[1] and the lymphatic system,[2] which distributes lymph. While humans, as well as other vertebrates, have a closed cardiovascular system (meaning that the blood never leaves the network of arteries, veins and capillaries), some invertebrate groups have an open cardiovascular system. The most primitive animal phyla lack circulatory systems. The lymphatic system, on the other hand, is an open system.

Two types of fluids move through the circulatory system: blood and lymph. The blood, heart, and blood vessels form the cardiovascular system. The lymph, lymph nodes, and lymph vessels form the lymphatic system. The cardiovascular system and the lymphatic system collectively make up the circulatory system.

Fire in My Heart, Ice in My Veins: A Journal for Teenagers Experiencing a Loss

veins of the heart - click on the image below for more information.

Fire In My Heart, Ice In My Veins A Journal for Teenagers by Enid Traisman. Teens can write letters, copy down meaningful lyrics, write songs and poems, tell the person who died what they want them to know, finish business and use their creativity to work through the grieving process.

Fire in My Heart, Ice in My Veins: A Journal for Teenagers Experiencing a Loss

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A Closer Look at the Structure of the Heart

Article by Alison Major

The heart is a hollow, muscular organ about the size of a closed fist. Located between the lungs in the mediastinum, it's about 12.5 cm (5") long and 9 cm (3½") in diameter at its widest point. It weighs between 250 and 285 g (8.8 and 10 oz).

Where's your heart?The heart spans the area from the second to the fifth intercostal space. The right border of the heart lines up with the right border of the sternum. The left border lines up with the left midclavicular line. The exact position of the heart may vary slightly with each patient. Leading into and out of the heart are the great vessels:

• inferior vena cava• superior vena cava• aorta• pulmonary artery• four pulmonary veins.

Slip and slideA thin sac called the pericardium protects the heart. It has an inner, or visceral, layer that forms the epicardium and an outer, or parietal, layer. The space between the two layers contains 10 to 30 ml of serous fluid, which prevents friction between the layers as the heart pumps.

Chamber madeThe heart has four chambers - two atria and two ventricles - separated by a cardiac septum. The upper atria have thin walls and serve as reservoirs for blood. They also boost the amount of blood moving into the lower ventricles, which fill primarily by gravity.

Blood pathwaysBlood moves to and from the heart through specific pathways. Deoxygenated venous blood returns to the right atrium through three vessels:

superior vena cava - returning blood from the upper bodyinferior vena cava - returning blood from the lower bodycoronary sinus - returning blood from the heart muscle

Get some fresh airBlood in the right atrium empties into the right ventricle and is then ejected through the pulmonary valve into the pulmonary artery when the ventricle contracts. The blood then travels to the lungs to be oxygenated.

Share the wealthFrom the lungs, blood travels to the left atrium through the pulmonary veins. The left atrium empties the blood into the left ventricle, which then pumps the blood through the aortic valve into the aorta and throughout the body with each contraction. Because the left ventricle pumps blood against a much higher pressure than the right ventricle, its wall is three times thicker.

ValvesValves in the heart keep blood fl owing in only one direction through the heart. Think of the valves as traffic police at the entrances to one-way streets, preventing blood from travelling the wrong way despite great pressure to do so. Healthy valves open and close as a result of pressure changes within the four heart chambers.

Matching setsThe heart has two sets of valves:

atrioventricular (AV) (between atria and ventricles) - tricuspid valve on the heart's right side and mitral valve on its left semilunar - pulmonary valve (between the right ventricle and pulmonary artery) and aortic valve (between the left ventricle and aorta).

On the cuspEach valve has cusps (leaflets), which are anchored to the heart wall by cords of fibrous tissue (chordae tendineae). The cusps of the valves act to maintain tight closure. The tricuspid valve has three cusps, the mitral valve has two cusps and each of the semilunar valves has three cusps.

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Veins
veins of the heart

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