Search results
Oct 30, 2023 · Cardiovascular system diagrams, quizzes and free worksheets. Overview of the main arteries of the circulatory system. The cardiovascular system is a vital organ system which is quite literally at the centre of everything. Comprised of the heart, blood vessels and the blood itself, it is divided into two loops which both begin in the heart.
- Circulatory System
Circulatory system. The circulatory system, also called...
- Heart
Worksheet showing unlabelled heart diagrams. Using our...
- The Pulmonary Circuit
Wondering how you'll ever remember all of this? Discover the...
- Learn Histology Faster With Quizzes and Flashcards
You’re going to be filling in a labeled worksheet of the...
- Circulatory System
Oct 30, 2023 · Worksheet showing unlabelled heart diagrams. Using our unlabeled heart diagrams, you can challenge yourself to identify the individual parts of the heart as indicated by the arrows and fill-in-the-blank spaces. This exercise will help you to identify your weak spots, so you’ll know which heart structures you need to spend more time studying ...
- Overview
- Anatomy of the heart
- How the heart works
- Valves
- The heart’s electrical system
- Blood vessels
- Cardiac arrest: When the heart stops
- Conclusion
The human heart is a finely-tuned instrument that serves the whole body. It is a muscular organ around the size of a closed fist, and it sits in the chest, slightly to the left of center.
The heart beats around 100,000 times a day, pumping approximately 8 pints of blood throughout the body 24/7. This delivers oxygen- and nutrient-rich blood to tissues and organs and carries away waste.
The heart sends deoxygenated blood to the lungs, where the blood loads up with oxygen and unloads carbon dioxide, a waste product of metabolism.
Together, the heart, blood, and blood vessels — arteries, capillaries, and veins — make up the circulatory system.
Below is an interactive 3D model of the heart. Explore the model using your mouse pad or touchscreen to learn more.
The heart consists of four chambers:
•The atria: These are the two upper chambers, which receive blood.
•The ventricles: These are the two lower chambers, which discharge blood.
A wall of tissue called the septum separates the left and right atria and the left and right ventricle. Valves separate the atria from the ventricles.
The heart’s walls consist of three layers of tissue:
The rate at which the heart contracts depends on many factors, such as:
•activity and exercise
•emotional factors
•some medical conditions
•a fever
•some medications
The heart has four valves to ensure that blood only flows in one direction:
•Aortic valve: This is between the left ventricle and the aorta.
•Mitral valve: This is between the left atrium and the left ventricle.
•Pulmonary valve: This is between the right ventricle and the pulmonary artery.
•Tricuspid valve: This is between the right atrium and right ventricle.
Most people are familiar with the sound of the heart. In fact, the heart makes many types of sound, and doctors can distinguish these to monitor the health of the heart.
To pump blood throughout the body, the muscles of the heart must work together to squeeze the blood in the right direction, at the right time, and with the right force. Electrical impulses coordinate this activity.
The electrical signal begins at the sino-atrial node, sometimes called the sinus, or SA, node. This is the heart’s pacemaker, and it sits at the top of the right atrium. The signal causes the atria to contract, pushing blood down into the ventricles.
The electrical impulse then travels to an area of cells at the bottom of the right atrium, between the atria and ventricles, called the atrioventricular, or AV, node.
These cells act as a gatekeeper. They coordinate the signal so that the atria and ventricles do not contract at the same time. There needs to be a slight delay.
There are three types of blood vessels:
Arteries: These carry oxygenated blood from the heart to the rest of the body. The arteries are strong, muscular, and stretchy, which helps push blood through the circulatory system, and they also help regulate blood pressure. The arteries branch into smaller vessels called arterioles.
Veins: These carry deoxygenated blood back to the heart, and they increase in size as they get closer to the heart. Veins have thinner walls than arteries.
Capillaries: These connect the smallest arteries to the smallest veins. They have very thin walls, which allow them to exchange compounds such as carbon dioxide, water, oxygen, waste, and nutrients with surrounding tissues.
The heart, blood, and blood vessels make up the circulatory, or cardiovascular, system.
Here, learn about some diseases that can affect this system.
The heart is essential to life — if it stops beating, blood will not reach the brain and other organs, and the person can die within minutes. This is called cardiac arrest.
If a person experiences cardiac arrest, they will be unable to speak or breathe, and they will have no heartbeat.
Anyone nearby should call 911 immediately and start cardiopulmonary resuscitation (CPR), pressing hard and fast with locked hands on the center of the person’s chest.
According to the Centers for Disease Control and Prevention (CDC), CPR can double or triple a person’s chance of survival after their heart stops.
The heart is an essential, powerful organ that constantly pumps oxygen and nutrients around the body.
If a person is born with congenital heart disease, or if damage occurs due to illness or other factors, the heart’s function may diminish, and this can lead to life threatening complications, such as heart failure.
Here, learn about preventing and treating different types of heart disease.
If the heart stops, a person cannot survive for long. Staying active and maintaining a healthful diet are two ways to protect the heart.
Learn about foods for a healthy heart here.
Read this article in Spanish.
6 - the heart : name the parts of the human heart. 7 - the muscles : Can you identify the muscles of the body? 8 - anatomical planes and directions : Do you know the language of anatomy? 9 - the spine : Test your knowledge of the bones of the spine. 10 - the skin : understand the functions of the integumentary system.
Oct 30, 2023 · That’s why we offer hundreds of anatomy practice quizzes, anatomy diagrams and anatomy worksheets on everything from the muscles of the upper and lower limb, to the parts of the brain, to the structure of the heart. You can bet that if there’s a structure you need to learn about, we likely have a quiz for it!
oke volume or heart rate.Blood volume is defined as the sum of formed elements and plasma volum. s in the vascular system. Blood volume varies with a. e, body size, and gender. Most adults have approximately 5 L of blood, which makes up 8% of the. body weight in kilograms. Blood pressure and volume are usua.
People also ask
Why do you need a heart anatomy quiz?
Are there any anatomy quizzes?
Can you use a quiz to learn anatomy?
How do I start learning the anatomy of the heart?
Why should you use unlabeled heart diagrams?
What should a heart eader be able to do?
Each of the quizzes includes 15 multiple-choice style questions. If you get a question right the next one will appear automatically, but if you get it wrong we'll tell you the correct answer. An overall score is given at the end of each quiz. Choose from the following : Anatomy - Identify the main arteries and veins :
