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- Annelida
- Mollusca
- Pisces
- Amphibia
Answer (Detailed Solution Below)
Option 1 : Annelida
Detailed Solution
Download Solution PDFThe correct answer isAnnelida.
- The heart is not myogenic in Annelida.
![[Solved] Heart is not myogenic in (2)](https://i0.wp.com/cdn.testbook.com/resources/lms_creative_elements/key-point-image.png "[Solved] Heart is not myogenic in (2)")
Key Points
- Annelids have a neurogenic heart.
- The neurogenic heart is a characteristic feature of arthropods and some annelids.
- In the neurogenic heart, the heartbeat is initiated by a nerve impulse coming from a nerve ganglion situated near the heart.
- Phylum Annelida
- Main features
- The body is long, thin, soft, and metamerically segmented.
- Locomotion takes place through Setae made up of Chitin.
- The alimentary canal is well developed.
- The nervous system is normal and blood is red.
- Excretion by nephridia.
- Both unisexual and bisexual.
- Example: Earthworm.
- Main features
- The myogenic heart is a characteristic feature of molluscs and vertebrates.
- In this type of heart,the heartbeat is initiated by a patch of the modified heart muscle itself.
![[Solved] Heart is not myogenic in (3)](https://i0.wp.com/cdn.testbook.com/resources/lms_creative_elements/additional-information-image.png "[Solved] Heart is not myogenic in (3)")
Additional Information
- Phylum Mollusca:
- The body is divided into a head and a muscular foot.
- The mantle is always present in it.
- The alimentary canal is well developed.
- Respiration takes place through gills orctenidia.
- Blood is colorless.
- Excretion takes place through the kidneys.
- Example: Pila, Octopus.
In mollusks, the heart is typically myogenic, which means that it can generate its own rhythmic contractions due to the presence of specialized pacemaker cells within the heart tissue. These pacemaker cells have the intrinsic ability to initiate and regulate the heartbeat independently of nervous input.
- Pisces:
- Aquatic life.
- All these are cold-blooded animals.
- The heart pumps only impure blood and has two chambers.
- Respiration takes place through gills.
- Example: Hippopotamus.
- Amphibia:
- These are found both on land and in water.
- All these are cold-blooded.
- Respiration takes place through the gill, skin, and lungs.
- They have a three-chambered heart.
- Example: Frog, Necturus, Toad, Ichthyophis, Salamander.
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