What is Circulation?
a. A normal person has around 5 liters of blood that is pumped through their body by the heart.
b. The circulatory system has three parts:
i. Pulmonary circulation (lungs).
1. This is the movement of blood from the heart to the lungs and back again.
2. There are one-way valves, which let blood into or out of the organs and keep the oxygenated blood separate from the oxygenated blood.
ii. Coronary circulation (heart).
1. This refers to the movement of blood through the tissues of the heart.
2. Every cell in your body needs oxygen, even the heart, so this process get oxygen to the heart tissues.
iii. Systemic circulation (rest of the system).
1. This system supplies nourishment, the water, oxygen, etc, that is in the blood to every cell.
2. It is a major part of the circulatory system.
c. Blood vessels.
i. Definition: hollow utensil for carrying something such as blood.
ii. There are three types of blood vessels:
1. Arteries: carry blood from the heart.
2. Veins: carry the blood back to the heart.
3. Capillaries: connect arteries to veins.
iii. Interesting Fact: All the blood vessels in an average child are over 60,000 miles long & an adult’s would be over 100,000 miles long.
iv. Heart rate.
1. The heart rate, or pulse, is the rate at which the heart is beating, per minute.
2. The rhythmic contraction of an artery keeps pace with the beat of the heart, so we can easily touch an artery and get an accurate measurement.
3. One way to test a person’s heart rate is manually, or just laying your hand on their wrist and counting the number of beats in a minute.
4. We plan to take heart rate using a heart rate monitor, which displays the heart rate digitally.
v. Blood Pressure.
1. The normal blood pressure is 110 to 150 over 60 to 80.
2. Blood pressure is measured using two numbers the diastolic and the systolic.
3. Diastolic is the greater number and is measured as the heart is beating.
4. The systolic is the lower number and is measured as the heart relaxes.
5. There are special instruments that doctors use to take blood pressure. They are made up of a cuff that attaches onto the left arm, a bulb for which to pump it up, & an electric box or any other pressure gauge.
6. We will use an electric box that tells us both numbers digitally.