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Transcript of The Heart
have two fluids that move through it: blood and lymph.
is composed of the cardiovascular and lymphatic systems -Cardiovascular system: blood, heart, and blood vessels -Lymphatic system: lymph, lymph nodes, and lymph vessels The <3 consists of muscle cells that contract in waves. When the first group of cells are stimulated, a chain reaction of the stimulation of cells with their neighboring cells occurs.
The wave of activity spreads in such a way that the atria and the ventricles contract in a steady rhythm.
In an average adult at rest, the heart beats about 70 times each minute.
A heartbeat has two phases: the systole and diastole. The closing of these two heart valves results in the characteristic lubb dup sound we call a heartbeat.
If one of the valves fails to close properly, some blood may flow backward, creating a different sound, which is known as a heart murmur. Arteries and Blood Pressure Celene Carreon and Dolores Herrera The Heart central organ of cardiovascular system
muscular organ that pumps blood through an intricate network of blood vessels
lies within the thoracic (chest) cavity, behind the sternum (breastbone) and between the two lungs Control of the Heartbeat Terms to know:
Hypertension - deoxygenated blood enters the right atrium
- the right atrium pumps deoxygenated blood into the right ventricle
- muscles of the right ventricle contract and force the blood into the pulmonary arteries, which lead to the lungs
- in the lungs, CO2 diffuses out of the blood and oxygen diffuses into the blood
- the oxygenated blood returns to the left atrium of the heart
- oxygenated blood is pumped into the left ventricle
- contraction of the muscular walls of the left ventricle force the blood into the aorta
- from the aorta, blood is transported to all parts of the body The Circulatory System... Celene Carreon and Dolores Herrera
6th Period Other notes about the heart:
slightly larger than a fist
beats more than 2.5 billion times in an average life span (Don't Stress! That's just a little background!) -The right side (of the septum) pumps blood to the lungs; the left to other parts of the body.
-As the ventricles pump, blood pressure closes the AV valves, preventing blood from flowing backward from the ventricles to the atria. This is what it's about--> Structure of the heart: - Blood returning to the <3 from parts of the body other than the lungs has a high concentration of carbon dioxide and a low concentration of oxygen.
- The left ventricle is the thickest chamber of the heart because it has to do the most work to pump blood to all parts of the body. Chapter 47 Section 1 TERMS TO KNOW:
Sinoatrial (SA) node
Atrioventricular (AV) node
Diastole TERMS TO KNOW:
Semilunar (SL) valve
Aortic valve TERMS TO KNOW:
Circulatory system TERMS TO KNOW:
Aorta Blood the circulatory system is known as a closed system because the blood is contained within either the heart or the blood vessels at all times
the blood vessels that are part of the closed circulatory system of humans form a vast network to help keep the blood flowing in one direction
an open circulatory system is the system in which blood leaves the vessels and circulates within tissues throughout the organism's body
each beat of the heart forces blood through blood vessels the thick walls of the arteries have three layers: an inner endothelial layer, a middle layer of smooth muscle, and an outer layer of connective tissue. this structure gives arteries a combination of strength and elasticity, which allows them to stretch as pressurized blood enters from the heart.
your pulse is the stretching of your arteries blood pressure is always highest in the two main arteries that leave the heart
in a normal adult, the systolic pressure is about 120 mm of Hg for males and 110mm of Hg for females
the diastolic pressure in a normal adult is about 80 mm of Hg for males and 70 mm of Hg for females
high blood pressure, or hypertension is a leading cause of death in many countries.
high blood pressure, or hypertension is sometimes referred to as the silent killer
blood pressure that is higher than normal places a strain on the walls of the arteries and increases the chance that a vessel will burst Vessels Capillaries and Veins Terms to Know:
Inferior vena cava
Superior vena cava from the aorta, the body's largest artery, blood travels through a network of smaller arteries, which in turn divide and form even smaller vessels, called arterioles
the network formed by capillaries is so extensive that all of the approximately 100 trillion cells in the body lie within about 125 um of a capillary
capillary walls are only one cell thick; gases and nutrients can diffuse through these thin walls the walls of the veins are also composed of three layers but they are thinner and less muscular than those of the arteries