Leaving Certificate Biology Homeostasis EQ iQuiz

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Homeostasis means maintaining a constant … Body shape External environment Body mass Internal environment

Which of the following is involved in homeostasis?

Brain Bladder Bones Bronchi

Which of the following animals is an endotherm?

Salmon Snake Seal Spider

Which of the following may result in a drop in water content of the blood?

Sleeping Exercise A cold day Drinking

The body temperature of an ectotherm varies with it’s … Food intake Internal temperature Fluid intake External temperature

At which temperature do human enzymes work best?

35 ° C 37 ° C 36 ° C 38 ° C

In cold conditions the blood capillaries in the skin … Move up near surface Dilate Constrict None of these

Which of the following controls the water content of the blood?

ADH FSH ADP HGH

Leaves of plants are well adapted for rapid gas exchange because they are … Narrow Thin Thick Green

Which homeostatic organ controls the pH of the blood?

Heart Kidney Skin Lung

Which of the following is not a means by which the body retains heat?

Hairs stand up Adipose tissue Blood capillaries constrict Sweat is released

ADH acts on which of the following parts of the nephron?

Proximal tubule & collecting Duct Distal tubule & collecting Duct Proximal tubule & Loop of Henle Distal tubule & Loop of Henle

The concentration in the blood of which of the following gases, controls breathing?

Oxygen Carbon dioxide Carbon monoxide All of these

What is the main source of heat that keeps the body at a constant temperature?

Exercise Metabolism Eating Breathing

Name the main hormone involved when internal body temperature drops.

Oxytocin Insulin Testosterone Thyroxine

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