Which is the term used to describe the concentration of sensory organs and a brain in a defined head region?

Which is the term used to describe the concentration of sensory organs and a brain in a defined head region?

In the animal kingdom, cephalization is??? concentration of sensory structures in the head. One trend in the evolution of animals is the increase in the number of tissue (germ) layers during embryonic development.

What is a concentration of nerves and sensory structures at the head end?

This is the real essence of cephalization, the concentration of nervous tissue into a single, controlling organ and the organization of sense organs into one area at the anterior (head) end of the body as opposed to the posterior (tail end.)

Is the concentration of sensory organs and nervous tissue in a defined head region of the body?

Cephalization is defined as the evolutionary trend toward nervous system centralization and the development of a head and brain. Cephalized organisms display bilateral symmetry. Sense organs or tissues are concentrated on or near the head, which is at the front of the animal as it moves forward.

What type of nervous system does a flatworm have?

Flatworms have a cephalized nervous system that consists of head ganglion, usually attached to longitudinal nerve cords that are interconnected across the body by transverse branches.

What is the concentration of nerves and sense organs in a head?

Cephalization is the concentration of nervous structures and functions at one end of the body, in the head.

What do you mean by cephalization in biology?

cephalization, the differentiation of the anterior (front) end of an organism into a definite head. Some groups of organisms show full cephalization, but because their bodies are not divided into distinct trunks and heads, they cannot be said to possess a distinct anatomical head.

What is cephalization Class 11?

Cephalization is the phenomena in which due to morphogenetic gradient the mouth, sense organs, and nerve ganglia are concentrated at the frontal end of the organism forming a head region. Cephalization was first observed in flatworms which are also known as Platyhelminthes.

How is the nervous system of the flatworm different from that of a human?

The nervous system of the flatworm has an organization different from the invertebrates describe above. It does have a nerve net, but these are connected by long nerve cords. Flatworms also have eyespots called “ocelli”. The ocelli are sensitive to light and are connected to the cerebral ganglia.

Do porifera have a nervous system?

Porifera, which are living sponges, have nothing to do with what we call sponges in everyday life. They belong, rather, to the animal kingdom. Porifera are stationary and live off the organism particles and plankton that they filter from the water, and they do not have a nervous system.

What is the concentration of sense organs into the anterior part of an organism to form a head region?

Cephalization
Cephalization is an evolutionary trend, whereby nervous tissue, over many generations, becomes concentrated toward one end of an organism. This process eventually produces a head region with sensory organs.

What is Cephalization Class 11?

What are the sensory organs and organ systems that become centralized through cephalization?

Cephalization is an evolutionary trend in which, over many generations, the mouth, sense organs, and nerve ganglia become concentrated at the front end of an animal, producing a head region.

Why did sensory organs accumulate closer to the nervous system?

Over the course of evolutionary history, as organisms developed, the sensory organs tended to accumulate nearer to the sensory organs, as they had receptors for the nervous system. Remember, evolutionary history might seem complex, but it is also pragmatic and logical in most situations. How Significant Was Cephalization?

Which is a distinguishing feature of the Bilateria?

Cephalization is associated with bilateral symmetry and forward head movement. Bilateria: Cephalization is a distinguishing feature of the Bilateria, a large group that includes the vast majority of animal phyla.

Is there a connection between cephalization and bilateral symmetry?

As evolutionary trends go, there are few that are as widespread and impactful as cephalization. There is also an interesting connection between cephalization and bilateral symmetry, another evolutionary facet in which organisms tend to develop in a symmetrical way (i.e., arms on both sides, two ears, two eyes etc.).