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sdas [7]
3 years ago
10

In the heart, an action potential originates in the __________.

Biology
1 answer:
jeka57 [31]3 years ago
3 0

Answer:

sinoatrial (SA) node

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Ntist is conducting an investigation that involves water, silver, carbon dioxide, and oxyg
shusha [124]

The correct option is (d)They are each made of matter. Some are compounds made of one type of element. Some are pure atoms.

Any substance with mass and volume is considered matter because it occupies space. Water is a substance that is created when Hydrogen and Oxygen are combined in a fixed ratio (2 H: O) with a chemical link. The elemental metal silver can be found in nature in its metallic form. Carbon is an element, and carbon dioxide as a compound is created when elements of carbon and oxygen are joined in a specific ratio to form the gas.

They are each made of matter. Some are compounds made of one type of element. Some are pure atoms.

Learn more about matter here:

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5 0
2 years ago
Who replaced circles with eclipses in a heliocentric model of the universe
zloy xaker [14]
The person is Kepler
5 0
3 years ago
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Match the appropriate food item with the indicator chemical you would use to detect the principal organic molecule present in th
Valentin [98]

Answer:

raspberry jam -  benedict's solution

honey -  benedict's solution

ground turkey - biuret reagent

oatmeal - iodine

Explanation:

Benedict's test is a test used to confirm simple carbohydrates. it helps in identifying reducing sugars that have free ketone or aldehyde functional groups. Raspberry jam has mainly carbohydrates that can be tested by this indicator.

An iodine test is for the determination of starch which is a non-reducing sugar such as oatmeal

Sudan IV (C24H20N4O) is used for the presence of staining of lipids, triglycerides and lipoproteins. There is no food item given that has a proper amount of fat or lipid

Beuret reagent is a protein testing reagent that shows the presence of the protein. Ground turkey has a huge amount of protein that can be indicated by this

4 0
3 years ago
What is a "start codon"? What is the nitrogen base sequence for the start codon?
ioda
The start codon is the first codon of a messenger RNA (mRNA) transcript translated by a ribosome.

Nitrogen base sequence for the start codon is AUG.
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3 years ago
What function does a flagellum have in a cell
Mars2501 [29]

Explanation:

Flagellum, plural flagella, hairlike structure that acts primarily as an organelle of locomotion in the cells of many living organisms. Flagella, characteristic of the protozoan group Mastigophora, also occur on the gametes of algae, fungi, mosses, slime molds, and animals.

Flagellum Definition

A flagellum is a microscopic hair-like organelle used by cells and microorganisms for movement. The word flagellum in Latin means whip, just like the whipping motion flagella (plural) often use for locomotion. Specialized flagella in some organisms are also used as sensory organelles that can detect changes in temperature and pH.

3 0
3 years ago
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