Nervous System

Neurons are the main cells that perform the function of transmitting electrical and chemical signals in the nervous system. They are specialized for communicating signals between different parts of the body.

As you age, your sense of smell can become weaker, making it harder to detect and distinguish between different odors. This decrease in sensitivity is due to changes in the olfactory system and a reduction in the number of olfactory receptors in the nose. Older adults may also experience a decline in their ability to identify and remember smells accurately.

The lacrimal gland is located superior and lateral to the eye within the orbit. It is situated near the outer canthus of the eye and is responsible for producing tears that lubricate and protect the eye.

Tears are produced by the lacrimal gland and the accessory lacrimal glands and cover the cornea. Tears then drain out the punctum in the medial eyelids, flow down the canaliculi into the lacrimal sac. They then drain down the nasolacrimal duct into the nose at the inferior meatus (under the inferior turbinate).
from the lacrimal galnd to the lacrimal canals (lacrimal puncta canaliculi) to the lacrimal sace, then the nasolacrimal duct and finally the nasal cavity

The parasympathetic nervous system decreases blood pressure by promoting relaxation and decreasing heart rate. It counters the effects of the sympathetic nervous system, which increases blood pressure.

The fiber that transmits impulses to the central nervous system is called an afferent or sensory fiber. These fibers carry sensory information from receptors in the body to the brain and spinal cord, allowing for the perception of different sensations like touch, temperature, and pain.

Chemical signaling between cells is advantageous because it allows for communication between distant cells and tissues. This form of signaling is also slower and more sustained than nervous signaling, making it suitable for coordinating long-term processes such as growth and development. Additionally, chemical signals can be released systemically throughout the body to affect multiple cell types simultaneously.

Yes, peripheral nerves connect the spinal cord to the limbs and other parts of the body. These nerves carry messages between the brain and the rest of the body, allowing for movement and sensation.

Nerves do not fire at varying intensities; for example, neurons won't fire at a stronger intensity if you're hit with a baseball in comparison to a marble. The difference between the two stimuli is the number of firing neurons. After being hit with a baseball, the affected neurons will fire more frequently than if hit with a marble.

Nothing stays the same, right? The answer is, of course.

The long branch of a nerve cell is called an axon. It transmits electrical signals away from the cell body to communicate with other neurons or muscles. The axon is covered in myelin, which helps to speed up signal transmission.

Yes, rods contain the photopigment rhodopsin which is sensitive to low light levels. Rhodopsin is composed of a protein called opsin and a light-sensitive molecule called retinal. When rhodopsin is exposed to light, it undergoes a chemical reaction that leads to the generation of electrical signals in the rods, initiating the visual process.

Schwann cells enhance the velocity of electrical transmission of an action potential along an axon in the peripheral nervous system by forming a myelin sheath around the axon. This myelin sheath insulates the axon, allowing for faster conduction of the action potential through a process known as saltatory conduction.

Hyporeflexia is typically caused by disorders of the peripheral nervous system, specifically affecting the spinal cord and peripheral nerves. These disorders can include conditions like peripheral neuropathy, Guillain-Barré syndrome, or nerve compression.

The lacrimal glands produce tears that help to lubricate the eye, keep it moist, and wash away debris or foreign particles. Tears also contain enzymes and antibodies that help to protect the eye from infections. Overall, the function of the lacrimal glands is essential in maintaining the health and function of the eye.

The effect of epinephrine mimics the effect of the sympathetic nervous system. Epinephrine is also known as adrenaline, and it activates the "fight or flight" responses in the body, such as increasing heart rate, dilating airways, and increasing blood flow to muscles.

A turtle's nervous system is made up of a brain and spinal cord that communicate with nerves throughout the body. Sensory information is received by the nervous system, processed by the brain, and then signals are sent out through the spinal cord to control movement and other bodily functions. The nervous system allows turtles to respond to their environment, move, and carry out essential functions for survival.

i think the activitity of neoron is to pass the the information from one neuron to another neuron throuh electric signals and lastly it changes in to chemical when it reaches to the another neuron.

The nucleus in a nerve cell is located towards the center of the cell, typically found close to the cell body or soma. It contains the cell's genetic material in the form of chromosomes and controls the cell's activities by regulating gene expression.

Yes, Schwann cells are responsible for myelinating nerve fibers in the peripheral nervous system. They wrap around the axon of the neuron, creating a myelin sheath that helps to increase the speed at which nerve impulses travel along the neuron.

An electrial nerve impulse travels across a synapse by diffusion. The neurotransmitter substance from the pre-synaptic cleft travels across the synapse via diffusion. This is then received by receptors in the post synaptic cleft

Synapses play a critical role in determining reaction time by transmitting electrical or chemical signals between neurons. The efficiency of synaptic transmission can impact the speed at which signals travel through the nervous system, affecting overall reaction time. Stronger or more efficient synapses can lead to faster response times, while weak or impaired synapses may result in slower reaction times.

The Nervous System has two separate control system the sympathetic and the parasympathetic stimulation. Both parts of the system work in opposition to each other. The sympathetic nervous system stimulates the heart, blood vessels, lungs and the metabolic system to prepare for the activity. The parasympathetic system is in control of rest and leisure periods, it also works to conserve energy. As you work out the sympathetic system takes over and act on both the heart and the release of hormones to stimulate the body into workout mode. The nervous system maintains homeostasis by sending signals to the brain and to the rest of the body.

Epinephrine and norepinephrine are two very structurally similar molecules. They've both involved in the sympathetic part of your autonomic nervous system.

Epinephrine (also known as adrenaline) is a hormone which is secreted from the adrenal medulla when activated by the sympathetic nervous system (during times of stress).

Norepinephrine (also known as noradrenaline) is a neurotransmitter that is released by neurons in the sympathetic nervous system.

Epinephrine and norepinephrine generally produce the same effects as they both interact with adrenergic receptors in the body.

Epinephrine is structurally different from norepinephrine as epinephrine has a methyl group (-CH3) attached to the nitrogen atom (making it a secondary amine), whereas norepinephrine is just a primary amine.

Image google 'norepinephrine and epinephrine' to view their chemical structures.