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B
9.
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C
13.
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D
16.
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Solution
The correct option is C
13.
The correct option is C.
Explanation for the correct option:
The dorsal or pericardial sinus, middle or perivisceral sinus, and ventral or perineural sinus are the three interconnected chambers of the cockroach hemocoel.
Cockroaches have a 13-chambered heart that is long, thick, and muscular.
A single heart is represented by each chamber.
It can be found in the hemocoel's pericardial sinus.
Each chamber of the heart receives oxygenated blood from the dorsal sinus through a pair of Ostia or valvular holes.
The heart beats 100-120 times per minute in a posteroanterior direction, causing blood to flow in the same direction.
Alary muscles, one pair in each segment, one on either side of the heart, are important for blood circulation in cockroaches.
The terga is linked to the alary muscles' pointed ends.
The first chamber leads to an aorta that opens into head sinuses that link to the pericardial sinus via the perineural and perivisceral sinuses.
Because the cockroach's blood is colorless and lacks hemoglobin, it is also known as hemolymph.
It is made up of a clear liquid called plasma and a large number of corpuscles known as hemocytes.
Circular pro leukocytes and amoeboid phagocytes are the two forms of blood corpuscles.
Final answer: The number of chambers in the heart of a cockroach is 13.
