The protein that carries oxygen in muscles is: MCQ with Answer and Explanation

Explanation:
Antonie van Leeuwenhoek, a Dutch tradesman, is credited as the 'father of microbiology'. In the 1670s, using his own handcrafted, high-quality single-lens microscopes (which could magnify up to 270x), he was the first person to observe and describe living, single-celled organisms, which he called 'animalcules'. These included bacteria, protozoa, and spermatozoa. Robert Hooke observed dead cells (cork) and coined the term 'cell'.

Explanation:
CNS = brain + spinal cord. The peripheral nervous system (PNS) includes cranial and spinal nerves. The autonomic nervous system controls involuntary functions.

Explanation:
Lymphatic vessels collect interstitial fluid (lymph) and return it to the venous circulation (subclavian veins). This maintains fluid balance. Along the way, lymph nodes filter pathogens. The heart pumps blood, kidneys filter blood, lungs exchange gases. The lymphatic system is unidirectional.