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alexandr402 [8]
3 years ago
11

what is a light year? Explain why light-years are used to measure distances and sizes in the universe

Biology
1 answer:
Neko [114]3 years ago
3 0

A Light Year is a mesurement of 5.879e+12 miles Compressed into one unit of mesurement or a "Light Year"

Light Years are used in the measurement of the universe because, to put it simply, SPACE IS BIG! The use of Light Years (5.879e+12 miles) Breaks the observable universe down into manageable chunks for astrologists.

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What is the sequence of travel by an impulse through the cardiac conduction system?
adoni [48]

The sequence of impulse through the cardiac conduction system starts from SA node passes to AV node to atrioventricular bundle fibers and finally to Purkinje fibers.

Heart is an organ that receives oxygenated blood form lungs and deoxygenated blood from different parts of body. Oxygenated blood is transported to different organs and deoxygenated blood is transported to lungs for oxygenation.

Now, to perform this transportation, the auricles and ventricles of heart contract and relax. In order to contract and relax, impulse generation is required, which begins at SA node or Sinoatrial node. It is also referred to as pacemaker of the heart. SA node contracts the atria and the impulse transfers to AV node or Atrioventricular node.

This is followed by transfer of impulse to atrioventricular bundle fibers which further passes it on to Purkinje fibres for ventricular contraction. Now the blood is sent to lungs and aorta as per it's oxygen status.

Learn more about cardiac conduction system -

brainly.com/question/2813924

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4 0
2 years ago
what is the subdivision of the peripheral nervous system that connects to sensory receptors and to skeletal muscles called
vampirchik [111]

Answer:

The somatic nervous system

Explanation:

The peripheral nervous system is categorized into two types: the autonomic and somatic nervous system.

The somatic nervous system controls the voluntary actions of the boys so is also known as the voluntary nervous system and the voluntary system involves the skeletal muscles therefore is also known as the skeletal nervous system.

The skeletal nervous system contains two types of neurons called the afferent neurons which carries the sensory input from the muscle to the CNS ans the efferent neurons which brings the impulse from the CNS to the muscles.

Thus, the somatic nervous system is the correct answer.

7 0
3 years ago
Which observation tool allows Shauna’s doctor to monitor her blood circulation in real-time? a microscope a telescope an X-ray a
Tamiku [17]

Answer:

ultrasound

Explanation:

4 0
3 years ago
9. What part of the body covers the windpipe when you swallow?
Sloan [31]

Answer:

epiglottis

Hope it helps:)

8 0
1 year ago
Read 2 more answers
Some peeled pieces of apple were placed in distilled water and some in very salty water. The cells in the apple pieces will
QveST [7]
I think that they will g<span>ain water in the distilled water and lose water in salty water. I think water will be lost because salt is used as an drying agent, it is why when it snow they will put salt on ice to keep the ice from being slippery because it dries things up. Distill just means to purify something.</span>
7 0
3 years ago
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