A soldier in combat is exposed to an explosion. His heart rate and blood pressure increase, and he feels hyper-alert. Which neurotransmitters and hormones are primarily responsible for his acute response?

An 82-year-old woman with a history of hypertension presents with increasing systolic blood pressures over the past year. Which of the following age-related changes most likely contributes to this trend?

A 58-year-old man with a history of myocardial infarction presents with palpitations and dizziness. His ECG shows wide QRS complexes at a rate of 160 bpm. What is the most likely cause of his arrhythmia?

A 25-year-old graduate student experiences intense anxiety before an important exam. She finds it difficult to concentrate and struggles to recall information she studied the night before. What is the most likely explanation for her cognitive impairment?

What is the most likely mechanism of cardiac valve damage in rheumatic heart disease?

As a medical professional, which patient would you recommend to get diagnostic testing for Klinefelter Syndrome?

Which of the following is NOT a common facial characteristic of Down Syndrome?

During early embryonic development, the primitive heart tube undergoes folding and looping. What is the primary purpose of this process?

Which of the following is a characteristic of monosaccharides? 

Why does aortic stenosis reduce stroke volume despite a lower aortic diastolic pressure?