The nervous system is derived from ectoderm endoderm mesoderm All of the above: it depends on whether the animal is a protostome or a deuterostome QUESTION 7 Planarians lack dedicated respiratory and circulatory systems because none of their cells are far removed from the gastrovascular cavity or from the external environment. they lack mesoderm as embryos and therefore lack the adult tissues derived from mesoderm. their flame bulbs can carry out respiratory and circulatory functions. their pseudocoelom carries out these functions. QUESTION 8 Animals with bilateral symmetry can be divided into similar halves by any plane through the longitudinal axis. are usually very slow-moving organisms. are relatively simple in structure. are better adapted for forward movement than radially symmetrical organis
Corona Radiata
Corona Radiata is a collection of nerve fibers present in the brain that carries messages between the brain cells of the cerebral cortex and the brain stem. Both brain stem and cerebral cortex play a role in motor function and sensation and it is the corona radiata that links both sensory and motor nerve pathways between these structures.
Neuron Structure
A neuron is defined as the functional unit of the body system called the nervous system. It is significant in transmitting signals that include receiving and sending the signals from a portion of the brain. The neurons are considered specialized cells in terms of their structure.
Afferent Neurons
Neurons are electrically excitable cells in the body specialized for receiving and transmitting information. They are referred to as the structural units of the nervous system. The important parts of a neuron include the cell body, dendrites, and axons.
Motor Homunculus
The term homunculus is Latin and is referred to as ‘little man’. In neuroanatomy, the cortical homunculus is either the motor or sensory distribution along the cerebral cortex of the brain. It was discovered by the great scientist ‘Wilder Penfield and Edwin Boldrey in the year 1937. It is a map that corresponds body part to touch sensitivity. The proportion of the sensory cortex to the size of the body region is irregular. For example, a small area is devoted to sensations that are arising from the trunk, and a large cortical area is devoted to the face and lips.
Nervous System
The nervous system is the portion of an animal's body that controls and transmits signals between various parts of the body. The central nervous system (CNS) and the peripheral nervous system (PNS) are the two primary components of the nervous system in vertebrates. The brain and spinal cord are housed in the CNS. The PNS is made up primarily of nerves, which are long fibers that link the CNS to every other part of the body, but it also includes peripheral ganglia, sympathetic and parasympathetic ganglia, and the enteric nervous system, which is a semi-independent part of the nervous system that regulates the gastrointestinal system.
-
The nervous system is derived from
ectoderm
endoderm
mesoderm
All of the above: it depends on whether the animal is a protostome or a deuterostome
QUESTION 7
-
Planarians lack dedicated respiratory and circulatory systems because
none of their cells are far removed from the gastrovascular cavity or from the external environment.
they lack mesoderm as embryos and therefore lack the adult tissues derived from mesoderm.
their flame bulbs can carry out respiratory and circulatory functions.
their pseudocoelom carries out these functions.
QUESTION 8
-
Animals with bilateral symmetry
can be divided into similar halves by any plane through the longitudinal axis.
are usually very slow-moving organisms.
are relatively simple in structure.
are better adapted for forward movement than radially symmetrical organisms.
Help with these Questions please
thank you!
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
