Circulatory System

Endocrine organs produce hormones. Examples of endocrine organs are the thyroid, ovaries, testicles, and adrenal glands.

the connection between the two is like this.

the nervous system sends the signal to the skeletal muscle to contract. This contraction causes the muscle to pull the bone, and the bone bends. This would mean that the movement of the skeleton is caused by nervous system which triggers the skeletal muscle to move the skeleton.

Both cellular waste and cellular fuel diffuse across the capillary walls to reach their destination. The rest of the system is meant to facilitate reaching all body cells with the capillaries.

Harvey, observing the notion of the heart in living animals, was able to see that systole was the active phase of the heart's movement, pumping out the blood by its muscular contraction. Having perceived that the quantity of blood issuing from the heart in any given time was too much to be absorbed by the tissues, he was able to show that the valves in the veins permit the blood to flow only in the direction of the heart and to prove that the blood circulated around the body and returned to the heart. Fabricius, his teacher in Padua, had discovered the valves in the veins.

The human heart is a four chambered muscular pump, whose sole task is to pump blood around the body.

The difference is that the heart of a fish has only two valves while th heart of a human has four valves. Also, there is a higher chance for the oxygenated blood and deoxygenated blood in fishes to mix rather than in humans.

arteries have thick walls that are both strong and flexible.

when your ventricles contract,blood surges through your

arteries,causing their elastic walls to expand and then relax!!! :)

A muscle is made up of hundreds of thousands of cells, specially conditioned to be able to tighten in on themselves, and relax, that allows free control of muscles, as bones, pivoting on the joints, are moved by the contractions.

diffusion A+

The peripheral vascular system is responsible for pumping blood into the brain. The carotid arteries are located in the neck and supply the brain with blood.

respiration

The pleurae cover each lung and line the inner surface of the thoracic cavity. The pleura that encloses the lung is called the visceral pleura. The pleura that lines the thoracic cavity is the parietal pleura.

The loss of the nucleus is all part of the red blood cell's adaptations for its function of carrying oxygen around the body. Each cell is packed with a protein called hemoglobin, which attracts oxygen very strongly when blood flows through the lungs, so can carry as much oxygen as possible.

Its other adaptation to its function is that it has a biconcave shape - this enables it to have a large surface area for picking up oxygen in the first place.

During their maturation in mammals, a red blood cells loses its nucleus, mitochondria and endoplasmic reticulum, which makes them inactive metabolically.

The pulmonary system is connected to the pulmonary system in two ways. First the circulatory system does the same for the pulmonary system as it does for every other part of the body -- it supplies food and oxygen and removes waste products and CO2. But, in addition the heart pumps blood through the lungs to remove CO2 and pick up oxygen.

I think it is Respiratory System...

Heart > artery > arteriole > capillary > venule > vein > heart

You could say veins, arteries, and capillaries, or heart, blood, and blood vessels, or pulmonary circulation, coronary circulation, and systemic circulation.

Right heart - lungs - left heart - arteries - capillaries - veins - (begin again).

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Absorption is the process that allows food to move from the small intestine to the blood stream. Absorption is critical because it allows the nutrients to be used by cells throughout the body.

This has to do with acid-base homeostasis. Normal blood pH is 7,4.

- Alkalosis = pH >7,4

- Acidosis = pH <7,4

Then you have 2 types for each one, respiratory or metabolic.

- Respiratory alkalosis = CO2 <40mmHg

- Respiratory acidosis = CO2 >45mmHg

- Metabolic alkalosis = HCO3- >26mEq

- Metabolic acidosis = HCO3- <22mEq

If your breathing rate goes beyond 20 per minute (hyperventilation), CO2 goes down and pH goes up. Then your body compensates this by losing HCO3- in the urine, lowering the pH.

If your breathing rate slows down below 15 per minute (hypoventilation), CO2 goes up and pH goes down. Then you reabsorb more HCO3- in the kidneys, raising the pH.

If your kidneys start malfunctioning, your body can't excrete acid compounds and HCO3- gets consumed, then the pH goes down. Your breathing rate goes faster in order to excrete more CO2, raising the pH.

And in some cases the kidneys reabsorb more HCO3- than they should, and pH goes up. Then your breathing rate slows down, CO2 goes up and pH goes down.

In some cases, pH can vary due to other reasons, such as diabetes or diarrhea, which can produce acidosis, or severe vomiting, that produces alkalosis. These are classified as metabolic as well, but can be regulated both by the respiratory and the urinary system, though the latter is rather inefficient in these cases.

what is the role of the brain in the curculatory system

When you breathe in air it goes in your lungs and the oxygen diffuses into the blood stream via the capillaries. Then the oxygen is carried throughout your body as needed.

To ensure that blood cells have just the right required amount of water content for them to be healthy. If they contain too much water, then this will pass through the cell's semi-permeable membrane out into the plasma; if they have too little, then the same will happen in reverse.

The digestive system absorbs the glucose in the small intestine. Then the glucose is now in the blood stream. The respiratory system needs the glucose to make energy. The circulatory system gets the oxygen pumped into the body. And now there are glucose and oxygen in the bloodstream. Now the respiratory system, the glucose and the oxygen react with each other and there is now energy.