The CNO Cycle in High-Mass Main-Sequence Stars Burns ________ to ________In

question 33

Multiple Choice

The CNO cycle in high-mass main-sequence stars burns ________ to ________in their cores.

• A) hydrogen; helium
• B) carbon; oxygen
• C) carbon; nitrogen
• D) This is a trick question as the CNO cycle does not operate in high-mass main-sequence stars.

---

Definitions:

Blood Pressure

The force exerted by circulating blood on the walls of blood vessels, a critical indicator of cardiovascular health.

Ectopic Pregnancy

A pregnancy where the fertilized egg implants outside the uterine cavity, often in a fallopian tube, which can lead to serious health risks.

Fallopian Tube

One of two tubes through which eggs travel from the ovaries to the uterus in the female reproductive system.

Transvaginal Ultrasound

An imaging procedure using sound waves to look at a woman's reproductive organs, including the uterus, ovaries, and cervix, through the vagina.