When does the anterior fontanel of an infant close

Answers

Answer 1

Answer:

Answer:

Within 10 to 24 months

Explanation:

In infants, you may observe soft spots in the head and these are called fontanelles. They are located in different specific areas and they close at varied times.

The posterior fontanelle is the first to close, usually around 2 to 3 months after the infant's birth. The second would be the sphenoidal fontanelle, closing at 6 months. The third would be the mastoid fontanelle, which closes within 6 to 18 months. Lastly, the anterior fontanelle, which closes around 10 to 24 months after birth.

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Which organisms carry out respiration,growth,movement and excretion Animals and plants

Animals only

Athropods and flowering plant only

Plants only

Answers

Answer:

Animals only is the correct answer

Explanation:

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Which phase of cardiac action potential is caused by closure of the fast sodium channels? phase 0 phase 1 phase 2 phase 3?

Answers

Answer: phase 1

A cardiac action potential can be divided into phase 0-4. In phase 0, the sodium channel is opened and sodium will come into the cell which causes a rapid depolarization. In phase 1, the fast sodium channel is closed and K+ channel starts to be opened which makes a small repolarization.

Determine whether the study is an experiment or an observational study, and then identify a major problem with the study.A medical researcher tested for a difference in systolic blood pressure levels between male and female students who are 12 years of age. She randomly selected four males and four females for her study.

Answers

Answer:

The study is an observational study because the researcher is simply collecting data from the students.

Explanation:

This case is an observational study since the medical investigator is observing and comparing individuals regarding a difference in systolic blood pressure levels between males and females.

For the study to be an experiment, the researcher should do an intervention on the students, to then collect data and study the effects of it. Also, he should group the students by chance to properly conduct an experiment.

Which of the following conduct the most pollination for angiosperms? squirrels
butterflies
birds
bees

Answers

In this item, we are given with four insects and animals: (1) squirrels, (2) butterflies, (3) birds, and (4) bees. we are to determine which among them conduct the most pollination for angiosperms. The answer to this item is bees. That is the fourth among the choices.

Bees are the most responsible organsism for pollination in angiosperms. They take nectar from the flowers of angiosperms,and bees take the pollen.When bee visits other plan, they may leave the pollen there and cause pollination. This is a mutual relationship.

Developed over 100 years ago, Koch's postulates is no longer used to determine etiologic agents of human infectious diseases. True False

Answers

Answer:

True

Explanation:

Koch's postulates was proposed to show a causative relationship between a microbe and a disease.

Koch's postulates

•The microorganism must be present in large quantity in all organisms affected by the disease, but should not be seen in healthy organisms.

Koch abandoned this due to his discovery of asymptomatic carriers of cholera and of typhoid fever. Asymptomatic or subclinical infection carriers are seen in diseases, especially viral diseases.

•The microorganism must be seperated from a diseased organism and nutured in pure culture.

This can suspended for specific microorganisms or entities which(at the current time) can't be nutured in pure culture. Viruses uses host cells to grow and replicates and not in pure culture.

•The cultured microorganism should lead to disease when it infects a healthy organism.

It says "should", not "must".

NOTE: NOT ALL organisms introduced to an infectious agent will be infected which may be due to certain factors like general health and good immune functioning; vaccination; or genetic immunity. Its best explained using the resistance to malaria as a result of presence of at least one sickle cell allele.

•The microorganism must be reisolated from the inoculated, diseased experimental host and observed as being identical to the basic specific causative agent.

A single pathogen may lead to several disease conditions. A singualr disease infection may be due to several different microorganisms. While some pathogens cannot be cultured in a pure culture in the lab, others can infects humans.

During inhalation air moves from the larynx directly to the

Answers

Answer:

During inspiration or inhalation air moves from the larynx to trachea.

Explanation:

Respiratory pathway during inhalation of air:

Nostrils - nasopharynx - larynx - trachea (through glottis) - bronchi - bronchioles - alveoli.

Its alveoli where the actual exchange of gases take place. Alveoli is thin walled and vascular.

it goes to the trachea

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