Which of the following is not a homeostatic response? In a...

Which of the following is not a homeostatic response? In a contest, a student eats an entire chocolate cake in 10 minutes, and his blood glucose level does not change dramatically. b. A jogger is sweating after a two-mile jog. c. The pupils in humans' eyes constrict when looking at a light. d. Physical activity increases carbon dioxide blood levels, which lowers blood $\mathrm{pH}$, and increases breathing. Oxytocin is released by the hypothalamus during human childbirth.

Which of the following is not a homeostatic response?
In a contest, a student eats an entire chocolate cake in 10 minutes, and his blood glucose level does not change dramatically.
b. A jogger is sweating after a two-mile jog.
c. The pupils in humans' eyes constrict when looking at a light.
d. Physical activity increases carbon dioxide blood levels, which lowers blood $\mathrm{pH}$, and increases breathing.
Oxytocin is released by the hypothalamus during human childbirth.

Key Concepts

Homeostasis

Homeostasis refers to the process by which living organisms maintain a stable and balanced internal environment despite changes in the external environment. This regulation is crucial for the functionality of cells and the survival of the organism, and it involves multiple physiological systems working together to maintain parameters such as temperature, pH, and blood glucose levels within narrow limits.

Negative Feedback Mechanisms

Negative feedback mechanisms are processes that detect deviations from a set point and initiate responses to counteract those deviations, thereby helping to restore balance to the system. This type of feedback loop is fundamental in maintaining homeostasis, as it ensures that any change in the internal environment is corrected by initiating opposing actions.

Positive Feedback Mechanisms

Positive feedback mechanisms are systems in which an initial change leads to actions that further enhance that change, forming a self-reinforcing loop. Unlike negative feedback which stabilizes the system, positive feedback drives processes towards a specific outcome rather than maintaining equilibrium, which is why responses mediated by positive feedback, such as the release of oxytocin during childbirth, are not typically classified as homeostatic responses.

Transcript

00:01 Okay, in order to solve this question, let's define the term homeostasis.

00:07 Homostasis is the state of steady internal, physical, and chemical conditions maintained by living systems like humans, like our bodies.

00:16 Let's give a simple example.

00:20 This is the hypothalamus.

00:22 This is the pituitary gland.

00:23 And this is going to be thyroid gland.

00:26 Okay.

00:28 Let's take it here, hypo -salamus, here pituitary gland, and here thyroid gland.

00:44 So the hyposalamus is going to release a hormone called trh.

00:48 And this trh is going to travel to the pituitary gland, and it is going to stimulate it to produce a hormone called esh.

00:55 This tsa is going to travel through the blood to the thyroid gland in order to stimulate it and produce thyroid hormone.

01:03 Hormones like t3 and t4.

01:05 Okay, so this system is very well regulated.

01:10 For example, if we inject fogenose t4 hormones, then we are going to increase the levels of higher hormones.

01:25 And this is going to break down or to this good homostasis in the body, okay? but our body has different mechanisms in order to maintain homostasis in our body.

01:35 So in the case of it, this example the hypothalamus is going to sense these high levels of thyroid hormones so in order to decrease the levels of them it is going to inhibit the release of trh in order to decrease the secretion of tsh and in order to give less stimulation to a thyroid gland to produce less t4 and t3 that are produced that are being produced unduly.

02:07 Okay so so this exogenous thyroid hormones caused it practically low levels of trh, low levels of tsah.

02:17 So it is going to decrease the production of endogenous thyroid hormones until the levels of thyroid hormones to normalize, to get normal.

02:28 When this is a shift, it means homostasis is a shift.

02:31 This hypothalamus is going to stop responding like this and everything is going to get turned normal.

02:37 This is an example of homostasis.

02:42 Another example is, for example, when we are exercising, when we are exercising our muscles are going to develop metabolism, like, faster.

02:55 Okay, there is going to be a very high metabolic activity in the muscles.

02:58 So there is going to be high production of carbon dioxide that is going to go to the blood.

03:05 Okay, so carbon dioxide is going to accumulate in the blood.

03:09 And this can be dangerous because it can cause acidosis.

03:16 So in order to, well, by causing acidosis, you are disrupting the homostasis.

03:21 Okay.

03:22 So when there are high levels of carbon dioxide in the blood, the brain is going to sense by the central chemoiceptors...

Please give Ace some feedback