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2 years ago

Why do people go pale when they are cold?

1 answer:

3 0

People get pale when they’re cold because your body is trying to conserve heat. Heat is nessecary to maintain homeostasis, and in a response to this, your blood vessels in your skin constrict (get smaller), so less blood goes to your skin, so that your body can redirect the blood to your core, where all the good stuff is like your organs.

Blood is what makes our skin a pinkish color, if white people did not have blood, we would look like vampires. When there is less blood in your skin, the pink color goes away and leaves a pale white.

I hope this helps!

You might be interested in

Which cell structure is made of a bilayer of phospholipids and encloses all cells?

wlad13 [49]

Answer:

The cell structure is the plasma membrane also known as the cell membrane.

Explanation:

The plasma membrane is the thin coat of lipids (phospholipids) that surrounds and encloses a cell, also can be called the cell membrane

4 0

2 years ago

Cerumen is produced by glands located in the

borishaifa [10]

Stratum corneum is the answer

4 0

3 years ago

Suppose that one of the normal children from Part B and one of the albino children from Part C become the parents of eight offsp

Aleks [24]

Full question from alternative source:

Albinism in humans is inherited as a simple recessive trait. for the following families, determine the most likely genotypes of the parents

Part A

Two normal parents have five children, four normal and one albino. What are the most likely genotypes of the parents?

Part B

A normal male and an albino female have six children, all normal. What is the most likely genotypes of the parents?

Part C

A normal male and an albino female have six children, three normal and three albino. What are the most likely genotypes of the parents?

Part D

Suppose that one of the normal children from Part B and one of the albino children from Part C become the parents of 8 offspring. What would be the expected number of normal and albino offspring?

Answer:

Part A - both heterozygous for the trait (Aa)

Part B - female aa, male likely AA

Part C - female aa, male Aa

Part D - 4 normal, 4 albino (50:50)

Explanation:

Part A

We are told that albinism is a recessive trait. Lets call it a and the normal allele A. Since neither of the parents have it, that must mean they each possess at least one copy of the dominant allele (either AA or Aa). Most of their children are normal, but 1 is albino. The albino child must have inherited two copies of the a allele, one from each parent. This means each parent must possess an a allele and must both be Aa.

Part B

Since the trait is recessive, we already know that the albino female must have the genotype aa. If her husband in homozygous normal (AA), all their children will be heterozygous (Aa), and therefore normal, which is the case in this cross. Therefore aa and AA are the most likely genotypes. However, it is still possible that the male has the genotype Aa. This would mean they had a 50:50 chance of producing an albino offspring. We know they have six normal children, so this is unlikely.

Part C

Since the trait is recessive, we know the female has the genotype aa. Unlike the last family, this family has some albino children. This means that the husband must be a carrier of the trait, but he is unaffected, so must be Aa.

As described in part B, if he is Aa and she is aa, they will have 50:50 normal:albino children. This is the ratio in this family.

Part D

The normal children from Part B are all heterozygous for the trait (Aa), inheriting one normal allele from their father, and one albino allele from their mother. The albino children from part C are all aa. Therefore, the cross is Aa x aa. We can draw a punnett square:

A a

a Aa aa

aa a Aa aa

Half the children have the genotype Aa, and half have the genotype aa. That means half will be normal and half will be albino. Therefore, 4 normal, 4 albino.

4 0

3 years ago

Why do populations of organisms fluctuate?

lianna [129]

As the world evolves, there is a change in the ecosystem, and with that comes the fluctuation. Organisms have have changing populations as they adapt, slowly die out, or thrive in the new ecosystem.

8 0

3 years ago

The seventh cranial nerve: A. olfactory B. trochlear C. vagus D. facial

Tamiku [17]

Answer:

The correct answer is D. The seventh cranial nerve is the facial nerve.

Explanation:

The facial nerve is a mixed cranial nerve, that is, it contains both sensory and motor fibers, present in mammals including humans in which it forms the seventh cranial nerve. Being a cranial nerve, it emits two fibers, one that runs on the right side of the face and the contralateral on the left. It starts of the brain stem, just between the brainstem and the medulla and controls the facial expression muscles, as well as the taste in the previous two thirds of the tongue. It also supplies parasympathetic preganglionic innervation to various nerve nodes in the head and neck.

6 0

3 years ago