Exercise 19: The Circulatory System
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It refers to the type of circulation where blood is transported via vessels.
closed circulation
Complete the sentence below: In open circulation, blood is referred to as ____________.
hemolymph
It refers to the type of circulation where blood freely moves within the body cavity.
open circulation
Are invertebrates which possess an open circulation.
• arthropods • mollusks
Are organisms with closed circulation.
• vertebrates • annelids • cephalopods
TRUE or FALSE: Flatworms and sponges do not possess a circulatory system.
True
Complete the sentence below: In flatworms and sponges, blood is transported between cells and tissues via body movements.
True
Complete the sentence below: In an open circulatory system of a cockroach, a medially located membranous tube runs along the thorax which is called the _______________.
dorsal aorta
Complete the sentence below: In an open circulatory system of a cockroach, the dorsal aorta continues into the abdomen as the ____________.
heart
It allows the inflow of hemolymph into the heart while its valves prevent backflow.
ostia
In an open circulatory system of a cockroach, it refers to the cavity where the heart is located.
pericardial sinus
In an open circulatory system of a cockroach, it refers to a membranous sheet which separates the pericardial sinus from the rest of the body.
dorsal diaphragm
Are the components of the circulatory system of vertebrates.
• blood • heart • arteries • arterioles • veins • venules • capillaries
It serves as the pump of the circulatory system, sending blood to the different body parts.
heart
Are blood vessels which return blood to the heart.
veins
Are blood vessels which transport blood away from the heart.
arteries
It is where gas exchange occur.
capillaries
Are found in between arterioles and in between venules.
capillaries
TRUE or FALSE: Arteries possess thicker, muscular walls.
True
In the circulatory system of tetrapods: It is where the heart is located.
pericardial cavity
In the circulatory system of tetrapods: It is a membranous layer covering the heart.
visceral pericardium
In the circulatory system of tetrapods: It refers to the lining of the pericardial cavity.
parietal pericardium (parietal sac)
TRUE or FALSE: The visceral pericardium is continuous with the parietal pericardium.
True
In the circulatory system of tetrapods: Identify the components of the heart.
• sinus venosus • conus arteriosus • left and right atria • ventricle