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#human physiology

31 public questions tagged with this topic.

ZOOLOGY

Which event typically triggers the onset of labor in humans?

The upregulation of oxytocin receptors in the uterine muscle (myometrium) enhances sensitivity to oxytocin, triggering labor. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, physiology, human health and related concepts as per latest syllabus.

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ZOOLOGY

What is the main nitrogenous waste product excreted by humans?

Humans are ureotelic, meaning they primarily excrete nitrogenous waste in the form of urea. This follows from NCERT principle where relation explains outcome clearly for students.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function, Topic: Structural organization and physiology.

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ZOOLOGY

Which heart valve prevents the backflow of blood from the aorta into the left ventricle?

The aortic valve prevents blood from flowing back into the left ventricle from the aorta. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, physiology, human health and related concepts as per latest syllabus.

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ZOOLOGY

Which of the following is a function of the vasa recta?

The vasa recta helps maintain the counter-current exchange system for water and ion balance. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.

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ZOOLOGY

Which statement about the composition of urine is incorrect?

Normally, proteins and blood lls are not present in urine, as they are retained in the bloodstream. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.

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ZOOLOGY

Which type of blood vessel has the thickest walls?

**Arteries** have thick walls to withstand high blood pressure as they carry blood away from the heart. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.

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ZOOLOGY

Which lung volume is the maximum amount of air a person can breathe in after a normal expiration?

Inspiratory Capacity (IC) is the total volume of air a person can inspire after a normal expiration (TV + IRV). This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Zoology section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Zoology portion (Latest NCERT Textbooks for Academic Session 2026-27 - Rationalized Edition for Class XI and XII), Topic: Structural organization, physiology, human health and related concepts as per latest syllabus.

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