11. Bone is the hard connective tissue comprising the skeleton. It is composed of Collagen fiber (protein) filled with mineral salts. Which of the following is/are major salts in the bone?
(a) Calcium phosphate
(b) Calcium carbonate
(c) Both of them
(d) None of them
12. What is enclosed within bone?
(a) Bone cells
(b) Blood vessels
(c) Nerves
(d) All of these
13. Which substance is found inside the cavity of bones?
(a) Bone marrow
(b) Red blood cells
(c) White blood cells
(d) Plasma
14. In early life, bone marrow produces red blood cells, but later on, by which substance does its color change from red to yellow?
(a) Calcium
(b) Accumulation of lipids (fat)
(c) Phosphate
(d) Bile
15. Name the part of the body that is a mass of interconnected nerve cells forming the earlier part of the central nervous system, whose activities it coordinates and controls?
(a) Nervous system
(b) Skull
(c) Cerebrum
(d) Brain
16. The brain is contained by the skull, which part of the brain contains centers for the control of respiration, heart beat rate and strength, and blood pressure?
(a) Medulla
(b) Medulla oblongata
(c) Cerebrum
(d) Cerebellum
17. Overlying the medulla oblongata is the cerebellum. What is its function?
(a) Retain memory
(b) Control thinking
(c) Coordinating complex muscular processes
(d) Control eye movements
18. What is the source of energy for the human brain?
(a) Fats
(b) Proteins
(c) Hormones
(d) Glucose
19. Which part of the brain is connected with thinking?
(a) Medulla
(b) Cerebellum
(c) Both of them
(d) None of these
20. What is cholesterol?
(a) White, crystalline sterol found in kidneys
(b) White, crystalline sterol found in the heart
(c) White, crystalline sterol found in the backbone
(d) White, crystalline sterol found throughout the body