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Rufina [12.5K]
3 years ago
12

During childbirth, a hormone produced by the pituitary gland causes muscles of the mother's uterus (or womb) to contract. The mo

re contractions there are, the more hormone is produced.
Which best explains why this occurs?

A. Positive feedback is used to build more contractions.

B. Positive feedback is used to lessen the effects of the contractions.

C. Negative feedback is used to build more contractions.

D. Negative feedback is used to lessen the effects of the contractions.
Biology
2 answers:
astra-53 [7]3 years ago
4 0
Positive feedback is used to build more contractions
Leno4ka [110]3 years ago
3 0

Answer:

Positive feedback is used to build more contractions.

Explanation:

Positive feedback mechanism in humans is also observed during childbirth which is induced by the pressing of the ovarian wall by the baby.

The pressing sensation is passed to the brain via different nerves, and in response, the brain stimulates the pituitary to produce oxytocin.

Oxytocin is responsible for the contractions of the uterine muscles which cause the movement of the fetus towards the cervix, further increasing the stimulus.  

The positive feedback loop continues until the baby is born.

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Could you help me pls? 15 points!!!
yawa3891 [41]

Answer:

a. F. W. Went isolated the chemical substance responsible for

communicating stimulus information- TRUE

b. The chemical substance responsible for communicating stimulus

information is a hormone- TRUE

c.Charles and Francis Darwin confirmed that the tip of a plant stem is

responsible for initiating the phototropic response- TRUE

d.When the tip of a stem is covered with a transparent cap, the stem bends

toward the light source anyway- TRUE

e. When the base of a stem is covered with an opaque shield, the stem

bends away from the light source- FALSE

f. An example of another control mechanism is that some plants require

more than 12 hours of darkness to produce flowers- TRUE

7 0
2 years ago
How does carbon monoxide disrupt oxygen distribution to the cells?
Andrew [12]
Its either B or D. That's about all i can do. sorry       
4 0
2 years ago
What does the layer of the atmosphere, Magnetosphere attract?
eimsori [14]
The magnetosphere attracts<span> charged particles emitted form the sun

hope this helps you</span>
5 0
3 years ago
How does a coronal mass ejection (CME) affect the solar wind?
brilliants [131]

Answer:

Option A

Explanation:

Corona is defined by the strong magnetic fields. When these strong magnetic fields confine solar atmosphere and produces violent bubble of gases then it is said to cause coronal mass ejection (CME).  

When a CME passes through the solar wind, it causes production of high velocity solar energetic particles that follow magnetic field lines and passes through the space between the Sun and the Earth. The charged particle added by CME intensifies the solar wind.  

Hence, option A is correct

4 0
2 years ago
A, B, C, D and E are pathogens of different diseases for human beings. The route of entry of pathogens in human body is differen
Goryan [66]

Answer:

Microorganisms which causes diseases is known as pathogen.

Explanation:

<u>PATHOGEN -:</u> Pathogens are agents that live in a host and are responsible for causing infections or diseases in that host, such as a human being. Microorganisms such as bacteria , viruses , fungi or protozoa, or other organisms such as parasites, worms and even contagious proteins such as prions, may be pathogens.

<u>Viruses:</u> Viruses are micro-organisms that are composed of nucleic acid and covered by a protein sheet. A lipid (fatty) outer layer is also present in some viruses. Enveloped viruses are called these. Non-enveloped viruses are considered those that do not have this lipid outer layer. Only inside their host's living cells are viruses able to replicate.<u> EXAMPLE -:</u>  Influenza (influenza A and B viruses) and the common cold (rhinovirus) are examples of infections caused by viruses.

<u>Bacteria: </u>These are microorganisms which have a nucleus containing DNA surrounded by a cell wall or membrane. Among bacteria, the composition of the cell wall differs. If they are able to access food and nutrients, they have a more complex structure than viruses and can multiply beyond the host.<u> EXAMPLE -: </u> Foodborne diseases can be caused by bacteria such as Salmonella enterica and Escherichia coli, while Staphylococcus aureus can cause skin infections.

<u>Fungi:</u> Fungi are single-celled or multicelled species that can live outside a host. They consume food and nutrients created after digestive enzymes have been secreted into their atmosphere. <u>example-: </u> The foot of the athlete (Trichophyton mentagrophytes) and yeast infections (Candida albicans) are examples of infections caused by fungi.

<u>Prions:</u> These are infectious agents made up entirely of proteins and capable of transferring to other prion proteins their infectious properties.<u> EXAMPLE -: </u>Extreme infectious diseases such as bovine spongiform encephalopathy (mad cow disease) and variant Creutzfeldt-Jakob disease (vCJD) can be caused by prions.

<u>Protozoa: </u>Protozoa are single-celled organisms that display habits that are similar to animals, such as the ability to travel through water, and are capable of harvesting other microorganisms. They are able to live outside the human host, but when they enter the human host and spread, causing infections and diseases, they may also be parasitic in nature. <u> EXAMPLE -: </u>Malaria and giardia include common infections

  • <u>Yes , pathogen enter into the body directly -:</u> Direct contact infections spread when, through direct physical contact with blood or body fluids, disease-causing microorganisms move from the infected person to the healthy person. Touching, kissing, sexual contact, contact with oral secretions, or contact with bodily lesions are examples of direct contact.
  • <u>INCUBATION PERIOD OF A PATHOGEN -</u>:The period of incubation is the interval between exposure to a pathogenic organism, a drug, or radiation, and when the first signs and symptoms are evident.
5 0
3 years ago
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