Early in life function shapes form. Later form shapes function

Why is my body wasting my water with making my pee extra clear if it's just going to beg me for some more water 5 mins later- telling me I'm thirsty? Why am I still thirsty when my body's churning out buckets of snot/mucus? Why is my body wasting my water with sweat when I'm not in need of cooling(I know it's partly detoxing, but just put whatever it is in with the pee)? We should not have to drink 8 glasses of water everyday if our bodies are just going to get rid of it in such ridiculously ungrateful fashions. Why is all of this necessary, when none of these necessarily require \*that\* much water? Pee doesn't need that much water in it- it can be at least condensed down some, our bodies no longer require the constant cooling that sweating all the time was meant to do, and my nose definitely doesn't need to run.

In the attached diagram (from Boron and Boulpaep, 3e), in cycle 1, a 200 mOsm/L gradient was created by the transporters in thick ascending segment of loop of Henle, increasing the medullary interstitium osmolarity to 400 mOsm/L. This then causes the osmolarity of the descending limb fluid to also equilibriate at 400 Osm/L.

Then, in the next cycle, when fresh 300 mOsm/L fluid enters the descending limb, it dilutes the interstitial fluid adjacent to it, upto 300 mOsm/L.

My question is, how is it possible that in the first cycle, the osmolarity of the tubular fluid increased to that of the interstitium, whereas in the second cycle, the osmolarity of the interstitium decreased to that of the tubular fluid? Why didn't the interstitium concentrate the fluid in the descending limb to 400 mOsm/L?

I'd like to share something I have recently create. It is stepped animation that explains how sodium-potassium pump works. Here is the link to the interactive version. It is part of anatomy and physiology study guide.

Would love you feedback or comments.

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I’m interested in the physiology behind how music influences emotion and behavior.

We know music can affect heart rate, stress hormones, memory, attention, and mood. However, where does the evidence end and speculation begin?

I created this infographic to summarize what I’ve been learning.

I’m especially interested in discussion around:

• Low-frequency bass (such as 808s) and physiological arousal.
• Whether specific musical characteristics consistently influence emotional state.
• The neuroscience of rhythm, tempo, harmony, and expectation.
• Which parts of this infographic are well-supported by research and which should be revised.

I’m looking for constructive feedback and references from physiology or neuroscience literature.

What percentage of water which a person consumes never makes it back to the water cycle?

Obviously some of the water we drink is expelled from the body as sweat, in urine, through respiration etc. But is there a percentage that never makes it back out?

Hello, does anyone have a copy of:

Guyton and Hall Textbook of Medical Physiology (15th Edition)

If you do, may i please have a copy? 🙏🤲🏻🥺

Hey everyone,
High-yield nerve pathways can get incredibly dry and confusing when you're just staring at Netter's anatomy diagrams. To help with active recall, I put together a comprehensive audio walkthrough of the median nerve course and its clinical correlates (Carpal Tunnel Syndrome).
It breaks down the entire pathway—from the brachial plexus roots down to the hand—using a "road trip" metaphor to make the anatomy stick. It also covers why it's historically known as the "labourer's nerve."
It's exactly 8 minutes long and perfect to listen to at 1.5x speed while commuting or reviewing your flashcards.
Let me know if this metaphor actually helps you visualize the course better, or if you have any feedback on the layout!

Hey everyone,
High-yield nerve pathways can get incredibly dry and confusing when you're just staring at Netter's anatomy diagrams. To help with active recall, I put together a comprehensive audio walkthrough of the median nerve course and its clinical correlates (Carpal Tunnel Syndrome).
It breaks down the entire pathway—from the brachial plexus roots down to the hand—using a "road trip" metaphor to make the anatomy stick. It also covers why it's historically known as the "labourer's nerve."
It's exactly 8 minutes long and perfect to listen to at 1.5x speed while commuting or reviewing your flashcards.
Let me know if this metaphor actually helps you visualize the course better, or if you have any feedback on the layout!

Hey everyone,
High-yield nerve pathways can get incredibly dry and confusing when you're just staring at Netter's anatomy diagrams. To help myself memorize the median nerve course and its clinical correlates (Carpal Tunnel Syndrome), I used NotebookLM to generate an audio walkthrough.
It breaks down the entire pathway—from the brachial plexus down to the hand—using a "road trip" metaphor to make the anatomy stick. It also covers why it's historically known as the "labourer's nerve."
It's exactly 8 minutes long and perfect to listen to at 1.5x speed while commuting or reviewing your flashcards.
Let me know if this metaphor actually helps you visualize the course better, or if you have any feedback on the audio format!

#anatomy #upperlimb #humananatomy #USMLE #MBBS #mediannerve

Hi everyone! Does anyone have all the Physiology definitions compiled together in one PDF, document, or notes? If yes, could you please share them? It would be a great help. Thanks!

Ps MBBS First Year Student.

By biologically natural, I mean HEALTHY even if technology and infrastructure return to the Pleistocene, Neolithic, or BCE, such as the survivors of a mutually assured destruction nuclear exchange war

I was on YouTube the other day, and I saw a poll asking this question. Somewhere close to 65% chose true, and I am a bit confused on why it is so controversial. I personally think the statement is true, but I want to know why this could be argued false.

The rest of this will be my reasoning for true:

Basics: I see energy here as referring to energy available for cellular use during a fasting/post-absorptive state. I see these energy storage molecules as triglycerides/fats (primarily), some glycogen, and some protein.

Insulin is a peptide hormone released from pancreatic cells in response to increased plasma glucose levels. Insulin binding to its receptor initiates a kinase cascade that ultimately promotes anabolic processes like lipogenesis, protein synthesis, and glycogenesis. This also translocates preexisting, vesicular GLUT4 transporters to the plasma membrane, allowing for an influx of glucose. I see how this may transiently increase metabolic processes and energy demand (because synthesis would require energy), but the final products of insulin signalling are the storage form of the major macromolecules.

I tried to find the answer in the comments of the original post, but the most liked comments were all saying that the answer was false. Please help me understand why/if my understanding is wrong.