(d)++The+heart



**(1) ****What is the job of the heart? ** The job of the heart is to push blood through the vessels of circulation.

**(2) ****How does the heart get fed? ** From the liver the blood vessels with lots of oxygen and foods go through into the heart.

**(3) ****What is the job of the coronary artery? ** The coronary artery carries oxygen and nutrients to the heart muscle.

**(4) ****Describe the blood entering the coronary artery? ** The blood that enters the coronary artery is always rich in oxygen and contains nutrients to feed the heart.

**(5) ****Your heart is always beating. Why doesn’t it get tired? **

The muscle of heart is different from the other muscles so it never becomes tired or fatigued. The reason it doesn't et tired is because the contraction of the heart relaxes immediately after contraction. Even the heart beats fater the period of muscle relaxation recovers it so the haert doesn't get tired.

**(6) ****<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">What is the pacemaker? ** <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 1in;">The heart has a region called a pacemaker which sends electrical signals to keep the pattern of contraction and relaxation.

**<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">(7) ****<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">The sequence of contractions in our hearts. **

<span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 1in; text-indent: -0.25in;">a. The atriums both contract together, forcing blood into the ventricle

<span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 1in; text-indent: -0.25in;">b. The ventricle both contract together, forcing blood out of the heart

**<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">(8) ****<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">How does your heart move the blood? ** <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 1in; text-indent: -0.25in;">- It sends the blood all over the body and the blood provides the oxygen and nutrients. <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 1in; text-indent: -0.25in;">- The heart gets the blood from the lungs and pumps it. <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 1in; text-indent: -0.25in;">- The heart muscle contracts to squeeze the blood along. The heart contracts and then relaxes 60 ~ 70 times per minut

**<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">(9) ****<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">For each side of the heart, describe the blood and where it goes **


 * <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 0.25in;">Left side || <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt;">Blood is from lungs || <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt;">Blood goes to the tissues ||
 * <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 0.25in;">Right side || <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt;">Blood is from the tissues || <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt;">Blood goes to the lungs ||

**<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">(10) ****<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">Why does the left side have a wall that is so much thicker than the right side? ** <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 1in;">Left side of the heart supply the blood and doing less work, so it has smaller volume and not as thick as right side. The right side of the heart is the powerhouse of the heart with the right ventricle pumping the deoxygenated blood back out to the lungs. The blood from right side of the heart provides the blood to whole body. Therefore it has larger volume and need greater pressure to force the blood. For that reason, the left side is stronger and much more muscular than the right side

**<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">(11) ****<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">The jobs of different parts of the heart **


 * **<span style="font-family: 'Calibri','sans-serif'; font-size: 12pt;">Part of heart ** || **<span style="font-family: 'Calibri','sans-serif'; font-size: 12pt;">Function (job) ** ||
 * <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt;">Atrium || <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 0.75in;">Receives blood at low pressure from the veins (which come from the lungs or tissues) ||
 * <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt;">Ventricle || <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 0.75in;">Pumps blood at high pressure out to the arteries (to the lungs or tissues) ||
 * <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt;">Valve || <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 0.75in;">Make sure that blood flows in the correct direction ||

**<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">(12) ****<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">Describe coronary heart disease. ** <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 1in;">The supply of blood to the heart muscle may be interrupted when the coronary arteries are blocked. The heart muscle cells have too little glucose and oxygen while poisonous wastes such as lactic acids build up. Other tissues no longer receive their needed nutrients and oxygen and this may be damaging or even fatal. This is when you get Coronary Heart Disease (CHD). Some things that increase the risk of getting CHD are: <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 1in; text-indent: -0.25in;">- Poor diet: too much fatty acids and saturated cholesterol in the blood <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 1in; text-indent: -0.25in;">- Poor lifestyle: smoking, lack of exercise, etc. <span style="font-family: 'Calibri','sans-serif'; font-size: 12pt; margin: 0in 0in 0pt 1in; text-indent: -0.25in;">- Genetic factors: having a family history of heart diseases.

<span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">  **How to draw a Heart (video):** <span style="color: #7030a0; font-family: 'Calibri','sans-serif'; font-size: 12pt;">media type="custom" key="8431642"