(Originais Teachy 2023) - Question Hard of Biology

The tissues of the human body perform specific functions and are organized into systems that ensure the organism's homeostasis. Imagine that a scientist, while studying the effects of a disease that affects skeletal muscle tissue, observed that, as a result of the disease, the contraction capacity of the muscle fibers was compromised. Based on this situation, describe: 1) The relationship between the structure of muscle fibers and their contractile function, including the main cellular components involved in this process. 2) Explain how a change in a tissue such as skeletal muscle can affect the functioning of other systems in the human body, considering the interdependence between tissues and systems for the maintenance of health.

Protozoans are single-celled eukaryotes that can be found in various aquatic and terrestrial environments, and some are known to cause serious diseases in both humans and animals. In a hypothetical scenario, a group of researchers discovered a new species of protozoan in a contaminated water sample. The researchers also found that this species has the ability to photosynthesize and can be classified as an alga as well. Consider the characteristics of this new species and the information about the diseases caused by protozoans, and answer the following questions: 1) Discuss the morphological and physiological features that allow this new species to be classified as both a protozoan and an alga. 2) Propose a potential mechanism by which this species could contribute to the spread of infectious diseases, considering its dual classification and the characteristics of known disease-causing protozoans. Your answer should integrate knowledge of both biology and environmental science, highlighting the interdisciplinary nature of understanding and addressing issues related to infectious diseases and environmental contamination.