15 - ..... are chemical substance released from axon terminals of presynaptic : A) neurotransmitter b) receptors c) chemical vesicles d) sodium channels d-41% 16- the normal hematocrit in women is: 0-42% b-47% - 45% 17 - Macula and cristae is functioning in (A) Hearing (6) Vision (C) Vestibular system (D) Smile 18- The increasing stiffness of the lens that occurs with aging makes accommodation for near visi increasingly difficult is (A) Myopic eye (B) Hypermetropic eye (C) Presbyopia (0) Accommodation 19 - Which of the following muscle is involuntary? (A) Skeletal muscle (8) Smooth muscle (C) Cardiac muscle (D) Smooth muscle and Cardiac muscle 20 - conveys nutritive material to brain and spinal cord: b) spinal nerve c) cerebrospinal fluid d) intracellular fluid A) cranial nerve