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2 years ago

What protects food from entering the larynx?

1 answer:

7 0

The epiglottis is a flap in the back of your tongue that prevents food from entering the larynx. When your mouth is closed, the epiglottis is in place and blocks the larynx opening. If your mouth is open, the flap lifts and the larynx is no longer blocked so you can breathe. This is why it's important to not chew with your mouth open... if you do, then food can go down the larynx by mistake.

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Now, consider the wave function ψ(x)=ceκx+de−κx in the region x<0. as x goes to negative infinity, this must become zero. wha

Mice21 [21]

Answer:

d is zero (0)

Explanation:

ψ(x)=ce^κx+de^−κx

Let say x = - 1000

We have something like

ce^κ* -1000 = approximately zero

Where we assume k to be 1

C becomes zero as it tend to negative infinity

But

If k is 1

de^−1* 1000 =d * 2 * 10^434

To have a zero function d = 0

So 0 * 2 * 10^434 = 0

7 0

3 years ago

After our sweat mixes with our skin bacteria and we don’t shower soon, the result is

enyata [817]

When you aren't showering as regularly, your skin can become oily and salty leading to blemishes and breakouts. Although your skin can get all sweaty during the day anyway, not bathing means these bacteria are not being thoroughly removed or cleaned.

6 0

2 years ago

The role that p53 protein plays in suppressing inappropriate progression through the cell cycle depends on all of the following

irinina [24]

Answer:

a. p53 activates transcription of WAF1.

Explanation:

WAF1 transcription occurs independent of p53 during oxidative stress so p53 does not play any role in cell cycle arrest in the signaling pathway which involves WAF1 .

In rest of the mentioned options, p53 plays a role directly or indirectly. During double stranded lesion in DNA in G1 phase, a sensor protein known as ATM binds the DNA lesion site. ATM is a serine/threonine kinase which phosphorylates another kinase known as chk2. After phosphorylation, chk2 stabilizes transcription factor p53. p53 further acts as a transcription factor for the synthesis of a protein known as p21 which inhibits G1 phase specific CDK and ultimately cell is arrested in G1 phase. The cell remains in arrested state until the DNA lesion is fully repaired. Hence, p53 indirectly blocks G1 to S transition with the help of p21.

As such WAF1 transcription factor involving pathway also requires p21 protein for causing cell cycle arrest but in this pathway p21 is not synthesized with the help of p53.

5 0

2 years ago

In a standard monohybrid cross between purple-flowered and white-flowered peas, what fraction of the purple-flowered peas in the

Advocard [28]

Answer:

1/3

Explanation:

A standard monohybrid cross is a cross that follows the dominance/recessive pattern from Mendel's experiment.

It means the purple flower color is dominant over the white flower color.

Assuming the allele for purple flower color is P and that of the white flower color is p, a standard monohybrid cross will involve a true breeding PP and pp.

PP x pp: Pp, Pp, Pp and Pp. All the F1 offspring will have purple flowers with Pp genotype.

At F2: Pp x Pp = PP, Pp, Pp, and pp.

3/4 or 75% of the F2 offspring have purple flower color out of which 1 is true breeding for the trait.

Hence the fraction of the purple flowered peas in the F2 that is expected to be true-breeding (PP) is 1 out of 3.

7 0

3 years ago

An infant client with severe diarrhea is being treated for dehydration. What are three (3) important nursing care measures to e

Alja [10]

Answer: The nurse needs to perform the following check on the child.

1 check for tachycardia(irregular beating of the heart.)

2.Capillary refill than 3 seconds

3.Sunken eyes .and fontanel(soft membranous gaps of infant skull).

These are all signs that the body electrolyte balance is deleted. And urgent need to adjust the is by the nurse.

Explanation:

6 0

3 years ago