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 my filament 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.

Explanation / Answer

1- kidney

2-10x

3-d 2,3,1,4

4-d sodium ion

5- c- depolarizarion phase of action potential

Note - kidney is not found in thoracic cavity but in abdominal cavity

Rapid influx of sodium due to opening of sodium gated channel causes depolarization of action potential

Ocular lens magnification used is 10x with 10,40,100 x objective lens

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