Have you ever wondered how many amazing things happen inside our bodies? Just like a network of roads in a big city, our bodies have a system of blood vessels that carry blood throughout them. This system includes main roads (arteries), small byways, and even very small roads that lead to homes. Those tiny roads are what we call 'Capillaries'. These are the ones that deliver oxygen and nutrients to every cell in our body and collect the waste products back there. So today we are talking about these tiny, but very important types of blood vessels, 'Continuous Capillaries'.
Simply put, what are these capillaries?
Imagine you order something online. A big truck brings it to the main city, then a small van brings it to your town, and finally a delivery boy on a bike comes and delivers the package to your door. That's how blood circulates in our body. The big blood vessels (arteries) that carry oxygen-rich blood from the heart are like the trucks. When that blood reaches the organs, it divides into smaller vessels. Finally, the capillaries are the smallest blood vessels that provide oxygen and nutrients to each cell. Just like that delivery boy.
The walls of these capillaries are made up of a special type of cell called 'endothelial cells' . These cells are closely connected to each other and are arranged in a continuous row, hence the name 'continuous'. These are the most common type of capillaries found in our body.
Are there types of these continuous capillaries?
Yes, there are two main types. The difference between them is the size of the gaps between the cells that make up the walls. Let's see what they are.
| Capillary type | Description and location |
|---|---|
| Continuous nonfenestrated capillaries | The gaps between these cells are very small. Because of this, only very small particles like water, glucose, hormones, and gases can pass through them. Like a sieve through which you strain a cup of tea. These are found in our nervous system, skin, and lungs . |
| Continuous fenestrated capillaries | These have slightly larger holes, called 'fenestrations', between the cells. This allows nutrients and some substances in the blood to pass through more quickly. These are found in our kidneys, small intestine, and endocrine glands . |
There is another type called 'sinusoidal capillaries'. They are not continuous, meaning there are even larger gaps between the cells. These are found in places like the liver, spleen, and lymph nodes.
How do these help the organs in our body?
These tiny blood vessels are an essential part of the functioning of many important organs in our body.
Protects the brain
Our brain is a very sensitive organ. It can't be penetrated by just anything. That protection is provided by a special system of capillaries. We call it the 'blood-brain barrier' . It's like a visa office for entering a country. It only allows the essential things the brain needs, like oxygen and water, to enter, and prevents toxins and germs in the blood from entering the brain. This is made up of those nonfenestrated capillaries that we talked about earlier.
Bringing hormones to the right place
Hormones are produced by the endocrine glands in our body. These hormones need to go to the appropriate organs in the body and control their function. These capillaries provide the 'delivery service' by adding those hormones to the blood and carrying them to the desired location.
Helps the kidneys
These capillaries play a major role in the process by which our kidneys filter blood and produce urine. During the filtration process, these capillaries also help the body reabsorb things like water and sodium that it needs.
Gas exchange in the lungs
When we breathe, the oxygen we inhale is added to the blood, and the carbon dioxide in the blood is delivered to the lungs to be exhaled through these tiny capillaries in the lungs.
Helps digestion.
We need to digest the food we eat and deliver the nutrients to our body's cells. In the small intestine, these nutrients are absorbed into the blood through capillaries. Then, the nutrients are distributed throughout the body.
What are the diseases that affect these capillaries?
Despite their importance, there are various medical conditions that can affect these tiny capillaries. Some of them may be genetic conditions that are present at birth, while others may develop later.
| Genetic (congenital) conditions | Non-genetic (later-onset) conditions |
|---|---|
| Arteriovenous malformation (AVM): A condition in which arteries and veins in the brain or spinal cord become tangled together, bypassing the capillaries. | Broken capillaries: Sometimes, coughing or vomiting can damage the small blood vessels under the skin. |
| Hereditary hemorrhagic telangiectasia: A condition caused by abnormal growth of blood vessels that can cause them to burst and bleed easily. | Capillary leak syndrome: A serious condition in which blood pressure drops suddenly. This may require treatment in the ETU. |
| Microcephaly-capillary malformation syndrome: Dilated capillaries in children born with a small head. | Spider nevus: A condition that looks like a spider with a small dot in the center and red blood vessels surrounding it. Common on areas such as the face and neck. |
| Macular degeneration: Damage to vision due to blood leakage from the capillaries of the eye. | Vasculitis: Inflammation of the blood vessels. This can cause capillaries to become blocked or burst. |
Scientists are still investigating whether changes in the function of these capillaries affect diseases such as Alzheimer's disease, stroke, and vascular dementia .
So, how do we keep our capillaries healthy?
It is in our hands to take care of these tiny, but very precious blood vessels. We don't have to do anything special for that. The main thing is to maintain a good lifestyle.
Common things you can do:
- Avoid smoking: Smoking is the biggest enemy of blood vessels. So if you smoke, try to quit.
- Be active: Daily exercise is very good for blood circulation.
- Maintain a healthy weight: Obesity puts pressure on blood vessels.
- Control alcohol consumption: Excessive alcohol consumption is harmful to blood vessels.
Also, if you have conditions like diabetes, high blood pressure , or high cholesterol , follow your doctor's instructions carefully. Controlling these conditions is very important for capillary health.
Protect the capillaries, especially on the face:
The skin on our face is very delicate, so the capillaries there can be easily damaged.
- When washing your face, wash it gently, without rubbing it vigorously.
- Be sure to use a good sunscreen when going outdoors.
- If you have a skin condition like rosacea , see a doctor and get proper treatment.
By taking care of these things, you can keep these tiny but indispensable workers of our body, the capillaries, healthy. If you have any problems or doubts in this regard, never hesitate to talk to your family doctor.
Take-Home Message
- Capillaries are the smallest blood vessels in our body. They are what carry oxygen and nutrients to all of our cells.
- Continuous capillaries are the most common type. Their cells are tightly connected to each other.
- The blood-brain barrier, which protects the brain, is made up of these capillaries.
- Things like smoking, unhealthy eating habits, and inactivity can negatively affect the health of capillaries.
- We can protect this valuable vascular system by maintaining a healthy lifestyle and controlling diseases like diabetes and high blood pressure.
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