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Which artery bifurcates to form the posterior cerebral arteries?

Click the NUMBER that points to the MCA. 

Click the NUMBER pointing to the posterior communicating artery. 

The vertebral arteries unite to form the _____________.

Which artery is seen in the image below?  

Blood flows _________ the probe in the ophthalmic artery. 

Scenario: A nurse is providing contraceptive counseling to a couple who prefers to use barrier methods for family planning. They are interested in learning about the effectiveness of various options when used correctly and consistently.   Question: During the counseling session, the nurse explains that some barrier methods are more effective than others when used consistently and correctly. Which method has the lowest failure rate under these conditions?

Scenario: A couple struggling to conceive visits a fertility clinic for an initial consultation. The nurse explains the diagnostic tests commonly performed to identify possible causes of infertility and emphasizes noninvasive options.   Question: During the initial evaluation for infertility, which noninvasive test is most commonly performed to assess a potential cause?

Scenario: A couple is attending a preconception counseling session and is learning about the timing of ovulation and fertilization. They ask the nurse how long sperm remain viable in the female reproductive system to better understand their chances of conception.   Question: During the counseling session, the nurse explains sperm viability in the female reproductive system. How long can sperm remain viable under optimal conditions?

Scenario: A 45-year-old woman visits her primary care provider for her annual checkup. She is concerned about her risk of breast cancer and asks the nurse about the best screening test for early detection.   Question: During the discussion about breast cancer screening, the nurse explains the most effective method for early detection. Which is considered the gold standard for breast cancer screening?