ORSEM 2025

How many bones does the average adult human body have?

• 201

• 206

• 222

• 230

Which organ is the body's largest in terms of surface area?

• Liver

• Skin

• Lungs

• Intestines

Which vitamin helps you see in the dark?

• Vitamin C

• Vitamin D

• Vitamin A

• Vitamin E

Which white blood cell acts as the body's first responder in infection?

• Monocyte

• Eosinophil

• Neutrophil

• Basophil

Which bacteria is famous for causing UTIs and is part of your gut flora?

• Salmonella typhi

• Lactobacillus

• Escherichia coli

• Clostridium tetani

Which dome-shaped muscle helps you breathe?

• Psoas major

• Diaphragm

• Intercostal

• Latissimus dorsi

Which enzyme helps break down the milk sugar lactose?

• Amylase

• Maltase

• Sucrase

• Lactase

When your muscles burn during intense exercise, which substance builds up?

• Pyruvate

• Lactate

• Glucose

• Urea

What’s the strongest muscle in the body relative to its size?

• Quadriceps

• Biceps brachii

• Masseter

• Gluteus maximus

Which part of your body has no blood vessels at all — it gets nutrients purely by diffusion?

• Retina

• Cornea

• Tongue

• Skin