Biology
Biology, 31.05.2020 00:03, annemcnair217

For each scenario in the attached handout write down whether the scenario is positive or negative feedback.

1. If blood temperature rises too high,

specialized neurons in the hypothalamus of the brain sense the change. These

neurons signal other nerve centers, which in turn send signals to the blood

vessels of the skin. As these blood vessels dilate, more blood flows close to the

body surface and excess heat radiates from the body.

2. If the blood temperature falls too low,

specialized neurons in the hypothalamus of the brain sense the change and

signals are sent to the cutaneous arteries (those supplying the skin) to constrict

them. Warm blood is then retained deeper in the body and less heat is lost from

the surface.

3. Part of the complex biochemical

pathway of blood clotting is the production of an enzyme that forms the matrix of

the blood clot. This has a self- catalytic, or self-accelerating effect, so that once

the clotting process begins, it runs faster and faster until, ideally, bleeding stops.

4. During childbirth stretching of the uterus

triggers the secretion of the hormone oxytocin, which stimulates uterine

contractions and speeds up labor.

5. The walls of arteries stretch in the

presence of high blood pressure. Baroreceptors located in these walls also

stretch and as a result, asignal is sent to the brain which in turn slows down the

body’s heart rate. This slows the flow of blood through the arteries causing less

pressure. As BP drops the baroreceptors become flaccid and a signal is sent to

speed up the heart rate.

answer
Answers: 1

Other questions on the subject: Biology

image
Biology, 21.06.2019 20:00, kmcpig
The phylogeny chart shows the evolution of camels. camelus is the modern-day camel. based on this chart, which three statements are true? ⭕ modern camels are more related to stenomylus than to eschatius. ⭕ stenomylous and modern camels do not share a common ancestor. ⭕ modern camels are more related to camelops than to aepycamelus. ⭕ pliauchenia and oxydactylus may share similar features. ⭕ procamelus and stenomylous may share similar features.
Answers: 2
image
Biology, 22.06.2019 05:00, cortneykeeler
Explain how organisms could be harmed by high levels of salt from roadways?
Answers: 1
image
Biology, 22.06.2019 06:20, kaytlyn16
Restless tectonic plates move (shift) between one and fifteen centimeters per year month day minute
Answers: 2
image
Biology, 22.06.2019 06:30, keelahbrown09
If animal agriculture was eliminated, how much grain would become available for human consumption?
Answers: 1
Do you know the correct answer?
For each scenario in the attached handout write down whether the scenario is positive or negative fe...

Questions in other subjects:

Konu
English, 26.09.2019 04:00