the blood vessels
The arteries
- Definition: The arteries are the blood vessels that carry the blood from the heart to the various body organs.
- Their walls are the thickest of other blood vessels and contain elastic material.
- The arterial lining layers (from the inner to the outer): single-cell layer, muscle cell layer
And elastin, connective tissue and elastin.
- Oxygen-rich blood flows.
Veins
- Definition: Veins are blood vessels that transport blood from various body organs back to the heart.
- Their walls are narrower than those of the veins and along the sides of the walls are (valves)
Causing the blood to flow only in one direction (towards the heart).
- The veins lining the veins (from the inner to the outer): one-cell layer, muscle cell layer,
Connective tissue.
- Poor blood flow in oxygen.
Capillaries
- The small blood vessels. Transfer the blood to all body cells.
- Their walls are the thinnest of the other blood vessels and contain only a single cell
In which the blood flows.
- The only single-cell layer that covers the capillaries allows the passage of substances from the blood to
The cells.
- The capillaries are spread throughout the body on a very wide network.
- Only in the blood vessels is there a passage of substances from the blood vessels into the body cells. The rest of the blood vessels are asleep
Just a flow of blood and no substance.
Heart operation
Heart structure
The heart is an organ built almost entirely of muscle. It is not very large, its size as a boxing size. The heart is
The strongest muscle in the body. It is divided into two sides - left and right, separated by a partition in each
Side There are two sections - rise and fall.
The ventricles are cavities surrounded by thick, muscular walls. The walls of the left room are thicker than these
Of the right ventricle. Also, the left ventricle is able to shrink more intensely than the right ventricle
Whose contraction is smaller. A single artery with a flow valve is provided from each chamber
Blood in only one direction (out of the heart in this case).
The heart is actually two pumps that operate as one) There is no situation where only one room is running and the other is not. two
The pumps work together. (Each room pushes the blood in a different direction - the left one pushes the blood to my father.
The arteries and the entire body whereas the right ventricle pushes the blood into the lungs.
The heart, like any other organ in the body, is also fed oxygen to its muscle cells. This is done through a artery
Coronary heads from which smaller arteries branch off and later also capillaries. People eating
Fat-rich foods can cause atherosclerosis, which is, in fact, an infectious disease
In the blood vessels but it is most dangerous when it damages the coronary blood vessels)
To the myocardium (in this disease, the fat reduces the arterial cavity and may even clog them.
Coronary will cause the death of cells that can disrupt myocardial activity. This condition is called muscle infarction
Heart or, heart attack.
heartbeat
The heartbeat stages are:
1. Relaxation - myocardium is limp. Blood flows from the pulmonary veins to the left ascension, and from the veins
Hollows) which drain all blood from the body (to the right ascension. The valves between the ascents and the ventricles)
Open and the blood flows from the room ascents, which are gradually filling up. Relaxation is also called
Diastole and it lasts about 3.3 seconds.
2. Shrinking the room and filling the rooms - relaxation is interrupted all at once. Right ascension and ascension
The left shrinks and pushes one last dose of blood into the rooms.
3. The contraction of the rooms - the pressure of the blood filling the rooms increases, the valves between the ascents
Rooms close at once. The blood-filled rooms shrink with great intensity, valves
The arteries
- Definition: The arteries are the blood vessels that carry the blood from the heart to the various body organs.
- Their walls are the thickest of other blood vessels and contain elastic material.
- The arterial lining layers (from the inner to the outer): single-cell layer, muscle cell layer
And elastin, connective tissue and elastin.
- Oxygen-rich blood flows.
Veins
- Definition: Veins are blood vessels that transport blood from various body organs back to the heart.
- Their walls are narrower than those of the veins and along the sides of the walls are (valves)
Causing the blood to flow only in one direction (towards the heart).
- The veins lining the veins (from the inner to the outer): one-cell layer, muscle cell layer,
Connective tissue.
- Poor blood flow in oxygen.
Capillaries
- The small blood vessels. Transfer the blood to all body cells.
- Their walls are the thinnest of the other blood vessels and contain only a single cell
In which the blood flows.
- The only single-cell layer that covers the capillaries allows the passage of substances from the blood to
The cells.
- The capillaries are spread throughout the body on a very wide network.
- Only in the blood vessels is there a passage of substances from the blood vessels into the body cells. The rest of the blood vessels are asleep
Just a flow of blood and no substance.
Heart operation
Heart structure
The heart is an organ built almost entirely of muscle. It is not very large, its size as a boxing size. The heart is
The strongest muscle in the body. It is divided into two sides - left and right, separated by a partition in each
Side There are two sections - rise and fall.
The ventricles are cavities surrounded by thick, muscular walls. The walls of the left room are thicker than these
Of the right ventricle. Also, the left ventricle is able to shrink more intensely than the right ventricle
Whose contraction is smaller. A single artery with a flow valve is provided from each chamber
Blood in only one direction (out of the heart in this case).
The heart is actually two pumps that operate as one) There is no situation where only one room is running and the other is not. two
The pumps work together. (Each room pushes the blood in a different direction - the left one pushes the blood to my father.
The arteries and the entire body whereas the right ventricle pushes the blood into the lungs.
The heart, like any other organ in the body, is also fed oxygen to its muscle cells. This is done through a artery
Coronary heads from which smaller arteries branch off and later also capillaries. People eating
Fat-rich foods can cause atherosclerosis, which is, in fact, an infectious disease
In the blood vessels but it is most dangerous when it damages the coronary blood vessels)
To the myocardium (in this disease, the fat reduces the arterial cavity and may even clog them.
Coronary will cause the death of cells that can disrupt myocardial activity. This condition is called muscle infarction
Heart or, heart attack.
heartbeat
The heartbeat stages are:
1. Relaxation - myocardium is limp. Blood flows from the pulmonary veins to the left ascension, and from the veins
Hollows) which drain all blood from the body (to the right ascension. The valves between the ascents and the ventricles)
Open and the blood flows from the room ascents, which are gradually filling up. Relaxation is also called
Diastole and it lasts about 3.3 seconds.
2. Shrinking the room and filling the rooms - relaxation is interrupted all at once. Right ascension and ascension
The left shrinks and pushes one last dose of blood into the rooms.
3. The contraction of the rooms - the pressure of the blood filling the rooms increases, the valves between the ascents
Rooms close at once. The blood-filled rooms shrink with great intensity, valves