Biology High School

Viewed in cross-section, the spinal cord is roughly _____, but slightly _____ both posteriorly and anteriorly

Answers

Answer 1

Viewed in cross-section, the spinal cord is roughly oval, but slightly flattened both posteriorly and anteriorly. The flattened regions are called the dorsal and ventral horns, respectively.

The spinal cord is a long, cylindrical bundle of nerve fibers and associated tissue that runs from the brain stem to the lower back. It is a crucial part of the central nervous system and plays a vital role in transmitting sensory and motor signals between the brain and the rest of the body. The oval shape of the spinal cord allows it to fit snugly within the vertebral column, which protects it from damage.

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Question 2
The end of a neuron, where acetylcholine-filled vesicles are located, is called the __________.
a. acetylcholine receptor
b. motor end plate
c. synaptic cleft
d. synaptic terminal

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The end of a neuron, where acetylcholine-filled vesicles are located, is called the synaptic terminal (option d).

The correct answer to the question is d. synaptic terminal. The synaptic terminal, also known as the axon terminal or presynaptic terminal, is the end of a neuron's axon where neurotransmitters are stored in vesicles. When an action potential reaches the terminal, it triggers the release of neurotransmitters such as acetylcholine into the synaptic cleft, the small gap between the terminal and the next neuron's dendrites or cell body.

Acetylcholine is a neurotransmitter involved in many bodily functions, including muscle movement, attention, learning, and memory. It is stored in vesicles within the synaptic terminal and released into the synaptic cleft when an action potential reaches the terminal. Once released, acetylcholine binds to receptors on the next neuron, triggering a response in that neuron.

Vesicles are small sacs that are used to transport and store various molecules within cells. In neurons, vesicles are used to store and transport neurotransmitters. When an action potential reaches the terminal, it triggers the release of the neurotransmitter-filled vesicles into the synaptic cleft.

In summary, the synaptic terminal is the end of a neuron where acetylcholine-filled vesicles are located. When an action potential reaches the terminal, it triggers the release of acetylcholine into the synaptic cleft, where it binds to receptors on the next neuron and triggers a response. Vesicles are used to store and transport neurotransmitters within neurons.

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It allows us to look at distance vision with the Snellen.

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The Snellen chart allows us to test distance vision. The Snellen chart is a tool used by eye doctors to measure a person's ability to see objects at a distance. The chart consists of letters or symbols in varying sizes that are placed at a distance of 20 feet from the patient.

The patient is asked to read the letters from the largest to the smallest until they are no longer able to see them clearly. This test helps to determine a person's visual acuity and is often used as a standard for measuring distance vision.

Their performance is recorded as a fraction (e.g., 20/20 or 6/6), with the numerator representing the distance they were from the chart and the denominator indicating the line they were able to read. This helps determine the sharpness and clarity of their distance vision.

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cAMP usually directly activates __________.
SHOW HINT
a) phosphodiesterase
b) adenylyl cyclase
c) protein kinase A
d) receptor tyrosine kinases
e) G proteins

Answers

Answer:b  

Explanation:b

Where is the external jugular vein located?â
âA) lower back
âB) head
âC) neck
âD) chest

Answers

The external jugular vein is located in option C) neck. This vein is an essential part of the circulatory system.

This vein is an essential part of the circulatory system and plays a vital role in returning deoxygenated blood from the head and neck region to the heart. It runs diagonally across the sternocleidomastoid muscle, a prominent neck muscle, and drains into the subclavian vein. The external jugular vein is larger and more superficial than the internal jugular vein, making it more visible and palpable in some individuals. Its primary function is to drain blood from the scalp, face, and parts of the neck, ensuring that oxygen-depleted blood is efficiently returned to the heart for reoxygenation and recirculation.

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