Which of the following is not found in the thoracic cavity? a. heart b. lungs c.

Question

Which of the following is not found in the thoracic cavity? a. heart b. lungs c. thymus d. kidney e. aorta The most commonly used ocular lens has a magnification of a. 5X b. 10X c. 15X d. 20X e. 30X List the following structures in order from smallest to largest. muscle fiber myofilament myofibril muscle fasciculus A. 4, 2, 3, 1 B. 2, 1, 4, 3 C. 3, 1, 4, 2 D. 2, 3, 1, 4 E. 1, 2, 3, 4 Depolarization of the cell membrane occurs when there is a rapid influx (inflow) of A. potassium ions. B. chloride ions. C. calcium ions. D. sodium ions. E. amino acids. What does "B" represent on the diagram? A. threshold B. depolarization C. depolarization phase of action potential D. repolarization phase of action potential E. relaxation

Explanation / Answer

Ans 1. d. Kidney, it is found in the abdominal cavity.

Ans 2. b. 10X is the commonest magnification of ocular lens. Other common magnifications are 40X and 100X.

Ans 3. d. Order from smallest to largest is : Myofilament - Myofibril - Muscle fibre - Muscle fasciculus.

Ans 4. d. Depolarisation occurs most commonly due to influx of sodium ions.

Ans 5. c. B represents depolarisation phase of action potential.

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