They've posted their secondary prompts for this cycle on their website:
Essay 1 (MD)
Comment on how you hope to impact medicine in the future. If examples are needed, feel free to refer to our eight Paths of Excellence. Do not exceed 1500 characters including spaces (about 250 words).
OR
Essay 1 (MSTP)
Briefly describe why you decided to apply to the University of Michigan MSTP. If you are interested in a specific department, program, or area of research for your Ph.D., please provide a brief explanation, we recognize that your interests may change. Do not exceed 1500 characters including spaces (about 250 words).
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Essay 2
Please respond to ONLY one of the following two prompts (select the question to which you are responding):
Describe your identity and how it has impacted the development of your values and attitudes toward individuals different from yourself and how this will impact your interactions with future colleagues and patients.
OR
If you recognize and/or represent a voice that is missing, underrepresented, or undervalued in medicine, please describe the missing voice(s) and how increased representation in medicine could impact the medical community.
Do not exceed 2500 characters including spaces (about 400 words).
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Essay 3
How was your journey to medical school affected by the COVID pandemic? Please feel free to describe any positive or negative aspects. Do not exceed 2500 characters including spaces (about 400 words).
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Essay 4
Tell us something you are passionate about and why. Do not exceed 1500 characters including spaces (about 250 words).