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Questions and Answers
The circulatory system's primary function in multicellular organisms is to facilitate the slow movement of substances throughout the body.
The circulatory system's primary function in multicellular organisms is to facilitate the slow movement of substances throughout the body.
False (B)
In humans, the circulatory system consists of a pump, a network of tubes, and a liquid medium for transport.
In humans, the circulatory system consists of a pump, a network of tubes, and a liquid medium for transport.
True (A)
A semi-open circulatory system means that blood flows freely throughout the body, exiting and re-entering vessels without a defined path.
A semi-open circulatory system means that blood flows freely throughout the body, exiting and re-entering vessels without a defined path.
False (B)
In a 'double circulatory system', blood passes through the heart twice for each complete circuit of the body.
In a 'double circulatory system', blood passes through the heart twice for each complete circuit of the body.
Pulmonary circulation oxygenates blood by directing it from the heart to the kidneys.
Pulmonary circulation oxygenates blood by directing it from the heart to the kidneys.
Deoxygenated blood from the lower body enters the heart through the superior vena cava.
Deoxygenated blood from the lower body enters the heart through the superior vena cava.
Systemic circulation sends deoxygenated blood from the left ventricle to the body's tissues.
Systemic circulation sends deoxygenated blood from the left ventricle to the body's tissues.
The primary role of the heart is to act as a filter, removing waste products from the blood.
The primary role of the heart is to act as a filter, removing waste products from the blood.
The human heart consists of five chambers, each playing a unique role in blood circulation.
The human heart consists of five chambers, each playing a unique role in blood circulation.
The atria are the lower chambers of the heart responsible for pumping blood out to the lungs and the rest of the body.
The atria are the lower chambers of the heart responsible for pumping blood out to the lungs and the rest of the body.
Flashcards
Circulatory System
Circulatory System
The transportation system in humans and animals, responsible for moving substances around the body.
Components of the Circulatory System
Components of the Circulatory System
The heart, blood vessels, and blood.
Closed Circulatory System
Closed Circulatory System
A system where blood flows within a closed loop of vessels connected to the heart.
Double Circulatory System
Double Circulatory System
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Pulmonary Circulation
Pulmonary Circulation
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Systemic Circulation
Systemic Circulation
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Heart's Function
Heart's Function
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Heart Chambers
Heart Chambers
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Atria
Atria
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Ventricles
Ventricles
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Study Notes
- Multicellular organisms need a transport system for the quick movement of useful and harmful substances.
- In humans and animals, the transportation system is the circulatory system.
Human Circulatory System Components
- A pump (the heart)
- A series of tubes (blood vessels)
- Media to flow through the tubes (blood)
- The circulatory system is a closed system, with all blood vessels connected in a closed loop to the heart.
- Blood only flows within the closed loop and never outside.
- The human circulatory system is a double circulatory system.
- This means blood travels through the heart twice for every trip around the body.
- This double circulatory system consists of 2 distinct loops.
Pulmonary Circulation
- This transports deoxygenated blood from the heart to the lungs.
- Blood is re-saturated with oxygen and then dispersed into the systemic circulation.
- Deoxygenated blood from the lower half of the body enters the heart from the inferior vena cava.
Systemic Circulation
- This carries oxygenated blood from the left ventricle through arteries to the capillaries in body tissues.
- Deoxygenated blood returns from tissue capillaries through veins to the right atrium of the heart.
The heart
- This is a pump that pushes blood to all parts of the body.
- The circulatory system includes 4 chambers and several valves.
- The heart is a muscular organ that pumps through repeated contraction and relaxation of heart muscles.
The four chambers of the heart
- Two upper chambers (atria)
- Two lower chambers (ventricles)
- The heart is divided into left and right sections.
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