The Most: Related to body parts

1.       Busiest organ	Heart
2.       Fastest known enzyme	Carbonic anhydrase
3.       Hardest part of the body	Enamel of tooth
4.       Heaviest organ	Liver (1.6 kilograms)
5.       Heaviest part of the body	Skull
6.       Largest (bulkiest) muscle of human body	Gluteus maximus (Buttock muscle)
7.       Largest blood cell	Monocyte
8.       Largest blood vessel (Artery)	Aorta (abdominal aorta)
9.       Largest bone of man	Femur bone
10.   Largest cell	Egg of Ostrich (15- 20 cm in diameter)
11.   Largest cell in human body	Ovum (egg)
12.   Largest cell organelle	Nucleus
13.   Largest endocrine gland	Thyroid gland
14.   Largest enzyme	Catalase
15.   Largest excretory organ	Kidney
16.   Largest gland	Liver (1.5 kg)
17.   Largest nerve	10th cranial nerve (Vagus)
18.   Largest organ	Skin (4 kg; 24 cubic feet)
19.   Largest salivary gland	Parotid gland
20.   Largest sense organ	Skin
21.   Largest vein	Inferior vena cava
22.   Largest WBC	Monocyte
23.   Longest cell	Neuron (Nerve cell)
24.   Longest muscle	Sartorius (Thigh muscle)
25.   Longest nerve	Sciatic
26.   Longest part of the alimentary canal	Small intestine (7m)
27.   Most abundant compound in a cell	Water (Next to water protein)
28.   Most abundant mineral in vertebrate body	Ca (2%); followed by P (1%)
29.   Most flexible organ	Skin
30.   Part having least amount of water	Enamel of tooth
31.   Part having much amount of water	Blood
32.   Part having thickest skin	Sole of the foot (about 4.7 mm)
33.   Part having thinnest skin	Face (0.12 mm)
34.   Second largest gland	Pancreas
35.   Smallest artery	Phrenics (To diaphragm)
36.   Smallest blood vessels	Blood capillaries
37.   Smallest bone	Stapes of ear
38.   Smallest cell	Mycoplasma  gallisepticum (PPLO)
39.   Smallest cell of the vertebrate body	Squamous epithelial cells
40.   Smallest cell organelle	Ribosome (Found in maximum number)
41.   Smallest endocrine gland	Pituitary
42.   Smallest enzyme	Peroxidase
43.   Smallest face bone	Lachrymal bone
44.   Smallest muscle	Stapedius (near stapes)
45.   Smallest nerve	Pathetic trochlear nerve (4th cranial nerve)
46.   Smallest salivary gland	Sublingual gland
47.   Smallest WBC	Lymphocyte
48.   Strongest bone	Femur bone (not jaw bone)
49.   Sweetest protein	Monellin
50.   Sweetest sugar	Fructose
51.   Thinnest skin	Conjunctiva
52.   Hardest working muscle	Heart muscles
53.   Strongest muscle based on its weight	Masseter (Jaw muscles), somebody says it is Uterus
54.   Muscle that can pull with the greatest force	Soleus

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The Most: Related to Microbes

PPLO

1.         Largest (longest) plant virus	Citrus tristeza (rod shaped)- 20,000 nm in size (0.02 mm)
2.         Largest animal virus	Parrot fever Virus (450 µ)
3.         Largest bacterium	Bacillus butschli (800mm). Spirillum volutans (13-15 mm in length)
4.         Largest forms of bacteria	Spiral. Up to 500 mm
5.         Largest protozoan (Largest amoeba)	Pelomyxa palustris (giant amoeba) about 2 mm
6.         Largest species of bacterium ever discovered	Thiomargarita namibiensis, which grows to 0.75 mm (0.03 in) in diameter, making it visible to the naked eye and up to a million times the size of more typical bacteria
7.         Largest sulphur bacterium	Thiophysa volutans (18 mm)
8.         Largest virus	TMV (300 nm), Pox virus (280 nm)
9.         Largest virus	Mimivirus (the Acanthamoeba polyphaga mimivirus), with mature particles of 400 nm in diameter (icosahedral capsid), 800,000 bases and 900 genes. Later research suggested that it could be up to 800 nm long, 1.2 Mbp and 1,260 genes
10.       Oldest microbe	Bacillus form of bacteria. 250 million years old.
11.       Smallest animal virus	Foot and Mouth virus (10 nm size), Polio virus (27 nm in diameter)
12.       Smallest bacterium	Dialister pneumosintes (0.15-0.3 mm in length). In nasopharynx of man.
13.       Smallest DNA bacteriophage	Phi-X174 phage, thought to be larger than Hepatitis B, at about 4 kb. It is important to consider other self replicating genetic elements such as satelliviruses and Viroids.
14.       Smallest DNA viruses	Hepadnaviruses such as Hepatitis B, at 3.2 kb and 42 nm; parvoviruses have smaller capsids, at 18-26 nm, but larger genomes, at 5 kb.
15.       Smallest infectious material	Prion (100 to 1000 times smaller than tobacco necrosis virus)
16.       Smallest known plant virus	Satellite tobacco necrosis virus (Alfalfa mosaic virus; 17 nm in diameter)
17.       Smallest organism	PPLO (Pleuro Pneumonia-like Organism) or Mycoplasma genitalium (200 to 300 nm in size)
18.       Smallest RNA viruses in terms of genome size	Retroviruses such as rous sarcoma virus with genomes of 3.5 kb and particle diameters of 80 nm
19.       Smallest self replicating organism	Mycoplasma
20.       Smallest virus	Virus of foot & mouth disease (20 nm)

TMV

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