b. False
b. neuron.
c. red blood cell.
d. white blood cell.
The basic structural unit of the nervous system is the neuron, which is a nerve cell that transmits information to other cells. This is important in biology and understanding how the nervous system works.
The basic structural unit of the nervous system is the neuron. Neurons, also known as nerve cells, are the primary cells of the nervous system that transmit information to other nerve cells, muscle, or gland cells. These specialized cells consist of a nucleus, dendrites, an axon, and synapses. The axon conducts electrical impulses away from the neuron's cell body, but it is the neuron itself that forms the fundamental unit of the nervous system, not the axon or any type of blood cell.
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The respiratory structure that controls breathing is the diaphragm.
The diaphragm is a dome-shaped muscle located at the bottom of the rib cage, separating the chest cavity from the abdominal cavity. It is the primary muscle involved in the process of breathing and plays a crucial role in controlling the initiation and regulation of respiration.
When the diaphragm contracts, it moves downward, expanding the volume of the chest cavity. This contraction creates a vacuum effect, causing air to be drawn into the lungs through the airways. This is known as inhalation or inspiration. On the other hand, when the diaphragm relaxes, it returns to its dome-shaped position, reducing the volume of the chest cavity and causing air to be expelled from the lungs. This is known as exhalation or expiration.
The diaphragm is controlled by the phrenic nerve, which receives signals from the respiratory centers in the brainstem. These centers continuously monitor the levels of carbon dioxide and oxygen in the blood and adjust the rate and depth of breathing accordingly. They send signals to the diaphragm and other respiratory muscles to regulate the respiratory rhythm and maintain the appropriate balance of gases in the body.
The diaphragm's ability to contract and relax in response to nerve signals allows it to control the process of breathing, ensuring the exchange of oxygen and carbon dioxide in the lungs. It plays a central role in respiratory physiology and is essential for sustaining life.
To learn more about respiratory structures, here
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Answer:
Significant increase in brain size
Explanation:
bcz of physical changes also.