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Questions and Answers
What constitutes a circulatory system?
What constitutes a circulatory system?
A group of organs that transport substances, such as oxygen, around the body.
Which of the following organisms have an open circulatory system?
Which of the following organisms have an open circulatory system?
- Elephants
- Humans
- Insects (correct)
- Whales
What type of circulatory system do humans have?
What type of circulatory system do humans have?
- Single circulatory system
- Double circulatory system (correct)
- Closed circulatory system (correct)
- Open circulatory system
The human heart has a two-chambered structure.
The human heart has a two-chambered structure.
What does the heart primarily do?
What does the heart primarily do?
What does the blood transport besides oxygen?
What does the blood transport besides oxygen?
What type of muscle is the heart made of?
What type of muscle is the heart made of?
The pulse can be felt in the wrist, temple, and ear lobe.
The pulse can be felt in the wrist, temple, and ear lobe.
Arteries carry blood under _____ pressure.
Arteries carry blood under _____ pressure.
Match the following components of the circulatory system with their functions:
Match the following components of the circulatory system with their functions:
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Study Notes
Circulatory Systems
- Circulatory systems transport substances throughout the body, such as oxygen.
- Open circulatory systems allow fluids to move freely between cells.
- In a closed circulatory system, blood is contained within vessels, allowing for control of blood flow speed, pressure, and distribution.
Single and Double Circuits
- A single circulatory system has a two-chambered heart, where blood flows in one direction.
- A double circulatory system has a four-chambered heart which pumps blood to the lungs, then back to the heart, then to the rest of the body.
Circulation
- The circulatory system carries dissolved food and oxygen needed for respiration throughout the body.
- The circulatory system consists of blood, blood vessels, the heart, and the lungs.
The Heart
- The heart is a muscular organ located in the thorax that continuously pumps blood around the body.
- Blood delivers oxygen, glucose, and removes waste products like carbon dioxide and urea.
Cardiac Muscle
- The heart is made up of cardiac muscle, which allows it to beat continuously.
- Continuous muscle contraction would cause fatigue and potentially cramping, but cardiac muscle avoids this.
Contraction and Relaxation
- The heart contracts and relaxes, pumping blood into arteries then allowing the chambers to refill with blood.
Pulse
- Arteries, capillaries, and veins are part of the closed circulatory system.
- The contraction of the heart muscle creates pressure, causing blood vessels to throb, which is known as a pulse.
- The pulse can be detected at various points on the body, including the wrist, temples, and earlobe.
Arteries
- Arteries carry blood under high pressure. They have thick muscle walls to withstand the pressure.
- They have a small lumen.
- The elastic walls stretch with each heartbeat and contract to push blood forward.
- This can be felt as a pulse.
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