Question 1

The myelin sheath that insulates the axon is formed by special glial cells called ______ ______.

Accepted Answer

The answer of The myelin sheath that insulates the axon...

Question 2

You are watching a horror movie,and you notice that your heart is beating fast,your mouth is dry,you are breathing rapidly.What division of the nervous system is directly responsible for these reactions?

Accepted Answer

The sympathetic nervous system is responsible for the fight-or-flight reactions in response to a perceived threat or emergency situation. This includes increased heart rate, rapid breathing, and dry mouth. The other options mentioned do not directly play a role in this specific reaction.

Question 3

The fovea centralis is

Accepted Answer

The fovea centralis is a small, central pit in the retina of the eye and is the point of the eye at which color vision is most acute. It contains a high concentration of cones, the photoreceptor cells that are responsible for color vision and the perception of fine detail.

Question 4

The part of the brain responsible for deep seated drives such as sex,hunger,thirst,anger and pleasure is the

Accepted Answer

The limbic system is a complex network of brain structures that are involved in emotional responses, behavior, motivation, and long-term memory. It includes the hypothalamus, amygdala, hippocampus, and other structures, and is responsible for deep-seated drives such as sex, hunger, thirst, anger, and pleasure.

Question 5

A fly will start its wings flapping if its feet are not touching the ground,and stop its wings when its feet touch the ground,even when its head has been cut off.This "decision" to fly has therefore been made by

Accepted Answer

The decision to fly in this scenario is made by interneurons in the ganglia, not the brain, as the behavior persists even when the fly's head (and thus its brain) has been removed. This indicates that the control mechanism for this behavior is located in the fly's body, specifically in the ganglia, which are clusters of nerve cells that process sensory input and control motor output independently of the brain.

Question 6

A nerve signal is a rapidly moving change in electrical potential called the ______ ______.

Accepted Answer

The answer of A nerve signal is a rapidly moving...

Question 7

Internal chemicals communicate from one organ to another target organ or tissue.However,_________ are chemicals released by individuals to influence the behavior of other members of their own species

Accepted Answer

Pheromones are chemicals released by individuals to influence the behavior of other members of their own species. Interio-hormones, excretions and releasing stimuli are not accurate terms for this concept. Biological symbol systems do not refer to chemical communication within a species.

Question 8

If we crossed over the nerves leading from the eye and from the ear before they reached the appropriate section of the brain,what would happen?

Accepted Answer

Crossing over the nerves leading from the eye and from the ear would result in the brain receiving sensory input in the wrong areas, causing confusion in the interpretation of sensory stimuli. This could lead to experiencing flashes of light when hearing loud noises and hearing sounds when seeing bright light, as the brain may interpret the signals from the wrong sensory modality.

Question 9

A cat learns to walk and take steps when young without having to think through "lift-paw-move-leg-set-down-paw" because the sequence has been practiced and coordinated automatically in it's

Accepted Answer

The hind brain is responsible for coordinating automatic, practiced movements such as walking, which do not require conscious thought once learned. This area includes structures like the cerebellum, which plays a key role in motor control and coordination.

Question 10

The organ of Corti is

Accepted Answer

The organ of Corti is part of the inner ear and is located in the cochlea. It contains hair cells that are responsible for converting sound waves into electrical signals that the brain can interpret as sound. Therefore, choice A is the correct answer.

Question 11

Which statement is NOT true about the autonomic nervous system?

Accepted Answer

The neurotransmitter associated with the parasympathetic system is acetylcholine, not norepinephrine.

Question 12

An animal with a simple net-like nervous system is the

Accepted Answer

Cnidarian hydra have a simple net-like nervous system called a nerve net, which allows for basic reflex actions and responses to stimuli. Flatworms also have a nerve net, but hydra are a better fit for this question since they are specifically mentioned as having a net-like nervous system. Earthworms, dogs, and molluscan octopuses have more complex nervous systems with a brain and specialized nerve structures.

Question 13

The active transport device whereby sodium is moved from inside the axon to the outside is referred to as the ______ ______.

Accepted Answer

The answer of The active transport device whereby sodium is...

Question 14

Which of the following wraps the spinal canal in three layers?

Accepted Answer

The meninges are three layers of protective membranes that surround the brain and spinal cord. They are the dura mater, arachnoid mater, and pia mater.

Question 15

Pacinian corpuscles adjusting to new shapes,no longer responding to constant pressure,is a condition called

Accepted Answer

Pacinian corpuscles are sensory receptors that respond to pressures and vibrations. When they are continuously stimulated by a constant pressure, they adapt by changing their shape and becoming less responsive to that stimulus. This process is known as adaptation.

Question 16

Non-neuron cells that outnumber neurons but are very important in neuron function are ____________ or glial.

Accepted Answer

The answer of Non-neuron cells that outnumber neurons but are...

Question 17

The brain of early fishes consisted of three principal regions called

Accepted Answer

The principal regions of the brain in early fishes are known as prosencephalon, mesencephalon (which includes the midbrain), and rhombencephalon (which includes the hindbrain). These regions are still used to describe the basic brain organization in modern vertebrates. Choice A describes regions found in modern fish but does not account for the hindbrain. Choice C describes ganglia, which are collections of nerve cell bodies found outside of the central nervous system. Choice D is not accurate terminology. Choice E describes regions found in modern vertebrates, but not specifically in early fishes.

Question 18

Which statement about the conscious brain is NOT correct?

Accepted Answer

The limbic system is not a center for mathematical ability or other non-emotional activities. It is involved in emotion, motivation, and memory.

Question 19

The crayfish has a cavity or ___________ lined with sensory seta or hairs.A grain in the cavity is pulled downward by gravity;the pressure against the bottom hairs of the cavity gives the crayfish a perception of being upright and when it changes orientation,the grain touches side hairs that make it realize it is not upright.Thus the crayfish "knows" which way is up in the dark.

Accepted Answer

The cavity described in the passage is the statocyst, which contains a statolith (grain). The sensory seta or hairs are present in the walls of the statocyst.

Question 20

The sense of smell is

Accepted Answer

All of the choices are correct. The sense of smell is coded by genes with each of 500-1000 genes coding for a separate odor receptor. It is poorer in humans when compared to other mammals such as dogs. It is detected with olfactory endings in a special epithelium covered by a thin film of mucus deep in the nasal cavity. It is also analyzed by the olfactory cortex that is connected to centers of emotions.

Quiz 33: Nervous Coordination: Nervous System and Sense Organs

The myelin sheath that insulates the axon is formed by special glial cells called .