The case of hm is a documented case of a patient whose speech skills and intelligence were unaffected by the removal of his hippocampus and parts of his temporal lobe but who could not form new long-term memories. which disorder did hm have?

The disorder that HM have is called anterograde amnesia, which is an inability to form or recall new long-term memories. This type of amnesia has a difficulty to learn new things but still have past memories like recognizing old faces, speak languages, sing and even remember the learnings from school before the surgery or accident.

the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.