Mu Sigma Human Body Science Quiz-1

Answer: c Three (cardiac, skeletal, smooth) Smooth muscles are found in our organs, blood vessels and throat, and cardiac muscle is a specialised muscle found only in the heart. Both these types of muscles are involuntary (they move without us thinking about it). Skeletal muscles are usually attached to bones, and come in pairs, such as the biceps and triceps. They are voluntary muscles, and unlike the other types of muscle can become tired through use.

Answer: d Dentine and enamel Teeth are made of dentine capped by hard enamel. Dentine is composed of apatite, a calcium phosphate mineral also found in igneous rocks.

Answer: b 1.5 metres Your large intestine is much shorter then the small intestine, and is the last stop in the digestive cycle. Its main job is to absorb water and inorganic salts back into your system. It is teeming with bacteria and produces gas and other products.

Answer: d All of the above You have not one but two anal sphincters, an internal and an external, a sphincter on the stomach (to prevent contents from spilling up into the esophagus), as well as the iris of your eye and the orbicularis oris muscle, which acts to close the mouth and purse the lips.

Answer: a The brain become dehydrated and shrinks away from the skull Alcohol has a number of effects on the brain. It dehydrates brain cells, robbing them of water and electrolytes. This is one of the factors causing the splitting headache that is a symptom of some hangovers.

Answer: b 10-20 per day The number of times you fart each day depends on the person as well as what you eat, but anywhere up to 40 times a day is considered normal, releasing between 500 ml and 2 L of gas per day.

Answer: a Blue Eye colour scales from blue to brown and is primarily due to the pigment melanin in the anterior layer and stroma, two layers of the iris. Blue eye colour cells (melanocytes) have relatively little melanin compared to brown eye cells. People with no melanin (albino) may have light blue or pinkish eyes from the reflection of light from blood vessels.

Answer: a Kidneys Most tissues including the skin and internal organs contain undifferentiated cells that can replace skin, muscle or other cells as they die. Other areas such as the kidneys lack these cells and lose cells through things like aging and drug abuse.

Answer: b 25% Women's fertility decreases over time, and once over 35 the chance of conceiving drops to about 10% each month.

Answer: c Light Melatonin, produced in the pineal gland, facilitates sleep. Bright light inhibits melatonin, which is why our natural rhythm makes us wake up in the morning, and go to sleep at night.