PAX Physiology 3

Question 1

What is the primary function of the kidneys?

Accepted Answer

Filtering blood and producing urine

Answer

Producing red blood cells

Answer

Storing bile for digestion

Answer

Secreting digestive enzymes

Question 2

Which two proteins are primarily responsible for muscle contraction through the sliding filament mechanism?

Accepted Answer

Actin and myosin

Answer

Collagen and elastin

Answer

Keratin and fibrin

Answer

Hemoglobin and myoglobin

Question 3

Which ion is essential for triggering skeletal muscle contraction?

Accepted Answer

Calcium (Ca²⁺)

Answer

Sodium (Na⁺)

Answer

Potassium (K⁺)

Answer

Chloride (Cl⁻)

Question 4

Which type of muscle tissue is found in the walls of internal organs such as the intestines and blood vessels?

Accepted Answer

Smooth muscle

Answer

Cardiac muscle

Answer

Skeletal muscle

Answer

Striated muscle

Question 5

What is the basic structural and functional unit of the kidney called?

Accepted Answer

Nephron

Answer

Alveolus

Answer

Glomerulus

Answer

Collecting tubule

Question 6

What term describes the body's ability to maintain a stable internal environment despite external changes?

Accepted Answer

Homeostasis

Answer

Metabolism

Answer

Catabolism

Answer

Osmosis

Question 7

Which skin layer contains melanocytes that produce the pigment responsible for skin color?

Accepted Answer

Epidermis

Answer

Hypodermis

Answer

Dermis

Answer

Stratum corneum