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True [87]
2 years ago
13

What structures hold the air passages open in the windpipe and bronchi?

Biology
2 answers:
yawa3891 [41]2 years ago
7 0

Answer:

<em>The structure that holds the air passages open in the trachea (windpipe) is </em><u><em>the hyaline cartilage</em></u><em> in the tracheal wall offering support and keeping the trachea drom collapsing. </em>

Explanation:

<em>The bronchi are divided in two by the level of the fifth thoracic vertebra the gaps that keeps the bronchus open are the cartilages filled with the trachealis muscle, that holds open the lumen of  the trachea and bronchis and allow the flexibility necessary for the respiration motion (inspiration and expiration). </em>

kobusy [5.1K]2 years ago
6 0

<h2><em>The trachea connects the larynx to the bronchi and allows air to pass through the neck and into the thorax. The rings of cartilage making up the trachea allow it to remain open to air at all times</em></h2>
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Answer:

2 molecules of ATP and 2 molecules of NADH

Explanation:

Glycolysis is the first step of cellular respiration (break down of glucose to extract energy) which occurs in the cytoplasm. Glycolysis is a pathway common to all living organisms- prokaryotes and eukaryotes, as it does not require oxygen to occur.

Glycolysis occurs in two major phases (ten steps) requiring 10 enzymes catalyzing each step; the energy-requiring phase and the energy-requiring phase.

In the energy-requiring phase, the starting molecule (glucose) gets rearranged in a series of chemical reactions, and two phosphate groups gets attached to it producing fructose-1,6-bisphosphate which is unstable, This modified sugar then splits in half due to its instability to form two different but inter-convertible phosphate-bearing three-carbon sugars (Dihydroxyacetonephosphate, DHAP and Glyceraldehyde-3-phosphate, G3P). Because the phosphates used in these steps come from 2 ATP molecules, 2 ATP molecules get used up in this phase

All the DHAP molecules get converted to G-3-P in order to enter the next phase.

In the energy-recovering phase, the 3-carbon sugar (G3P) is converted into another three-carbon molecule called pyruvate, through a series of reactions. In these reactions, two ATP and 1 NADH molecules are made. This recovery phase occurs twice (one for each of the two isomeric three-carbon sugars, DHAP and G3P). Hence, a total of 4 ATP and 2 NADH molecules are produced in this phase.

Overall, Glycolysis converts one glucose (six-carbon) molecule to two pyruvate (three-carbon) molecules and a net release of 2 ATP molecules (4 overall - 2 used) and 2 NADH molecules.

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3 years ago
A group of mutations, known as MT-ND1, have been identified in mitochondrial DNA. These mutations are associated with a number o
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Answer:

The human mitochondrial DNA (mtDNA) is a double-stranded, circular molecule of 16 569 bp and contains 37 genes coding for two rRNAs, 22 tRNAs and 13 polypeptides. The mtDNA-encoded polypeptides are all subunits of enzyme complexes of the oxidative phosphorylation system.

Explanation:

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From which of the following does the basic structure of hair and nails form?
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