Fox/Human Physiology - Critical Thinking Activities

Critical Thinking Activities - Chapter 12 Answers

Isometric (329).
Most cases of ALS are not hereditary but one approach to a cure, rather than a treatment, is genetic engineering. This would require producing a gene that codes for non-defective superoxide dismutase (341).
The use of ATP may have evolved earlier and become more widespread. The direct use of CP would require massive genetic mutations. Adenosine is also used in a number of other places in a cell (DNA, RNA, NAD, etc.) so its manufacture is more widespread. Other than energy transfers and storage, CP is used as an intermediate in amino acid metabolism. There is no specific place in Fox (or in most books) where this question is answered, it is primarily a hypothesis. I posed it and provided this answer only to provoke interest.
This pectoralis major muscle of primarily ground-dwelling birds is made up of fast-twitch fibers so it is white (351). These birds use their pectoralis muscle for escapes from danger rather than for flying long distances. Birds that migrate usually have red pectoralis muscles.
The muscles that blink your eyes are fast-twitch and they fatigue faster than other types of muscles (352). Your eye muscles work as quick as a blink of an eye!