N214 HUMAN BIOLOGY II NAME LECTURE EXAM I VERSION A INSTRUCT

N214 HUMAN BIOLOGY II NAME LECTURE EXAM I VERSION A INSTRUCTIONS 1. FILL IN THE BOXES WITH THE LETTERS OF YOUR LAST AND FIRST NAME AND DARKEN IN THE CORRESPONDING OVALS YOU MAY WRITE ON THE TEST!!!!! 1. The inferior point of the heart is called the A) base. B) apex. C) inferior border. D) right border. E) left border. 2. The muscle layer of the heart is the A) epicardium. B) myocardium. C) endocardium. D) visceral pericardium. lines the chambers of the heart, covers the heart valves, and is continuous with 3, The the endothelium. A) epicardium B) myocardium C) endocardium D) visceral pericardium E) parietal pericardium

Solution

1.The correct answer is : B.apex

Reason: Apex is the blunt end at the tip of the heart and is the inferior point of heart.

2.The correct answer is :B.myocardium

Reason: Myocardium is the thickest layer of heart that is muscular and forms the middle layer of the three layers of the heart.

3.The correct answer is :C.endocardium

Reason:Endocardium is as smooth membrane that is usually thin and performs the mentioned function.

14.The correct answer is: B.AV valves close

Reason:At the apex of the heart, the first heart sound is heard as the AV valves close.

15.The correct answer is: B. the atrioventricular valves and semilunar valves are closed.

Reason:Isovolumic phase of ventricular systole involves the closure of atrioventricular valves and semilunar valves.

16.The correct answer is:C.80-100

Reason:80-100 beats is the correct answer among all the options.

17.The correct answer is:B. Calcium channels remaining open

Reason:When calcium channels remain open, that contributes to the long plateau phase of cardiac muscle.

18.The correct answer is:C. tetany

Reason:Tetany is inhibited due to long refractory period in the cardiac action potential.

49.The correct answer is:A.neutrophils

Reason:Neutrophils include 40-75% of the total white blood cells in peripheral circulation.

50.The correct answer is :C.dissolves clot

Reason: Fibrinolysis dissolves blood clots enzymatically by breaking down the fibrin.