Final answer:
The muscle cells of the species would also contain 40 chromosomes.
Step-by-step explanation:
In the given question, it is stated that the nerve cells in the species contain 40 chromosomes. In general, nerve cells are somatic cells and they are diploid, which means they have two sets of chromosomes. So, if the nerve cells have 40 chromosomes, then the species is most likely diploid with a total of 2n = 40 chromosomes.
Now, muscle cells are also somatic cells, and they would also have a diploid number of chromosomes in most species. Therefore, we can assume that the muscle cells in this species would also have 2n = 40 chromosomes.
So, the number of chromosomes found in the muscle cells of this species would be 40 chromosomes.