Where is the ventral nerve cord on an earthworm?

Where is the ventral nerve cord on an earthworm?

Where is the ventral nerve cord on an earthworm?

The ventral nerve cord (formed by nerve cells and nerve fibers) begins at the sub-pharyngeal ganglia and extends below the alimentary canal to the most posterior body segment.

What blood vessel in an earthworm can be seen on the underside of the worm?

ventral blood vessel
Locate the dark line that runs down the dorsal side of the worm, this is the dorsal blood vessel. The ventral blood vessel can be seen on the underside of the worm, though it is usually not as dark.

Do earthworms have ventral heart?

Hint: Earthworm is a worm, which means it doesn’t have a true heart but they have aortic arches, which connect ventral and dorsal vessels and pump the blood.

What is the ventral blood vessel of a worm?

Dorsal and ventral blood vessels The dorsal blood vessel runs along the length of the upper side of the earthworm. It contracts and pumps blood to the aortic arches. The ventral blood vessel runs along the lower length of the earthworm.

Is the nerve cord on the dorsal or ventral side in an earthworm?

Cerebral ganglion The earthworm’s ‘brain’. Earthworms have a simple nervous system. The cerebral ganglion is connected to a ventral nerve cord that runs the length of the body. Each segment is connected to this cord, allowing earthworms to move and respond to light, touch, chemicals, vibrations and more.

How many hearts does an cockroach have?

13 chambered
It is transformed into funnel shaped chambers with Ostia. Cockroach has a 13 chambered tubular heart. Oxygenated blood enters each chamber through a pair of a slit like openings known as Ostia.

How can you tell the difference between the dorsal and ventral surfaces of an earthworm?

The dorsal surface of some species of earthworms is darker than its ventral surface. The bottom-side of an animal is called the ventral surface. In many animals, the ventral surface is a lighter colour or shade than the dorsal surface. The periproct is the last segment of an earthworm.

Do cockroaches have 2 hearts?

Cockroaches have multi-chambered hearts shaped like tubes that are much more resistant to failure than human hearts. The chambers are organized sequentially, each one pushing blood into the next, until the ideal output pressure is reached in the last chamber.

Can a person have 2 hearts?

Aside from conjoined twins, no human is born with two hearts. But in the case of extreme heart disease, called cardiomyopathy, rather than receiving a donor heart and removing yours, doctors can graft a new heart on to your own to help share the work. This is more commonly known as a piggy-back heart.

Why do cockroaches have a 13 chambered heart?

13 – Chambered heart occurs in (D) Cockroach. Explanation: The heart is tube shaped and even if it stops the insect doesn’t die as it has thirteen chambers unlike in humans who have four chambers in the heart. The heart performs the role of pumping oxygenated blood throughout the body to help it function.

What is difference between dorsal and ventral?

The main difference between dorsal and ventral is the area of the body to which they refer. In general, ventral refers to the front of the body, and dorsal refers to the back. These terms are also known as anterior and posterior, respectively.

What is the main function of Prostomium in earthworm?

Earthworms use the prostomium to see their environment, as earthworms have no eyes, ears, nose or hands. They depend on the prostomium and skin to help it feel their way through the soil. As the earthworm tunnels through the soil, it excretes mucus from its body.