Assertion: - Neurons are structural and functional unit of nervous system. Reason: - They Coordinate various body parts during any body function.
a. both assertion and reason are true and reason is the correct explanation of assertion
b. both assertion and reason are true but reason is not correct explanation of assertion.
c. Assertion is true but Reason is false.
d. Both Assertion and Reason are false.
Answers
Answer:
Nervous systems throughout the animal kingdom vary in structure and complexity, as illustrated by the variety of animals shown in Figure 16.2. Some organisms, like sea sponges, lack a true nervous system. Others, like jellyfish, lack a true brain and instead have a system of separate but connected nerve cells (neurons) called a “nerve net.” Echinoderms such as sea stars have nerve cells that are bundled into fibers called nerves. Flatworms of the phylum Platyhelminthes have both a central nervous system (CNS), made up of a small “brain” and two nerve cords, and a peripheral nervous system (PNS) containing a system of nerves that extend throughout the body. The insect nervous system is more complex but also fairly decentralized. It contains a brain, ventral nerve cord, and ganglia (clusters of connected neurons). These ganglia can control movements and behaviors without input from the brain. Octopi may have the most complicated of invertebrate nervous systems—they have neurons that are organized in specialized lobes and eyes that are structurally similar to vertebrate species.
Explanation:
Mark as branliest
a. both assertion and reason are true and reason is the correct explanation of assertion
Neurons. Neurons, often known as nerve cells, are the nervous system's fundamental structural and functional elements. Every neuron has a body (soma) as well as a number of processes (neurites). The cellular organelles are housed in the nerve cell body, which is also where neural impulses (action potentials) are formed.
Nerve impulses are electrical messages that they convey. Neurons are supported by glial cells. They give nutrition and other elements to neurons, for example.
A cell body, dendrites, and axon make up a cell. Neurons are nerve cells that transfer nerve impulses to other cells. Sensory neurons, motor neurons, and interneurons are all types of neurons.