Chat GPT Question Second Test

1. The endocrine system works most closely with which system to maintain homeostasis?

A) Digestive

B) Nervous

C) Respiratory

D) Skeletal

B) Nervous

2. Which statement correctly describes endocrine glands?

A) They contain ducts

B) They secrete only enzymes

C) They are ductless and release hormones internally

D) They release substances onto body surfaces

C) They are ductless and release hormones internally

3. Compared with the nervous system, endocrine responses are generally:

A) Faster and shorter

B) Slower and longer-lasting

C) Faster and longer-lasting

D) Identical

B) Slower and longer-lasting

4. A cell responds to a hormone only if it:

A) Contains hemoglobin

B) Has the appropriate receptor

C) Is located next to the gland

D) Is a blood cell

B) Has the appropriate receptor

5. A decrease in the number of hormone receptors on a target cell is called:

A) Up-regulation

B) Down-regulation

C) Amplification

D) Antagonism

B) Down-regulation

6. Up-regulation occurs when a target cell:

A) Decreases receptor number

B) Increases receptor number

C) Stops producing ATP

D) Destroys the hormone

B) Increases receptor number

7. Which is a lipid-soluble hormone?

A) Insulin

B) Growth hormone

C) Cortisol

D) ADH

C) Cortisol

8. Which class of hormones usually binds to receptors inside target cells?

A) Water-soluble hormones

B) Lipid-soluble hormones

C) Protein hormones only

D) Peptide hormones only

B) Lipid-soluble hormones

9. Water-soluble hormones generally bind to receptors located:

A) In the nucleus

B) In the cytoplasm

C) On the plasma membrane

D) On DNA

C) On the plasma membrane

10. Which second messenger is commonly used by water-soluble hormones?

A) DNA

B) cAMP

C) ATP synthase

D) Hemoglobin

B) cAMP

11. Most lipid-soluble hormones travel in the blood:

A) Attached to transport proteins

B) Inside platelets

C) Completely dissolved in water

D) Inside leukocytes

A) Attached to transport proteins

12. Most water-soluble hormones travel in blood:

A) Bound to albumin

B) Unattached in plasma

C) Bound to hemoglobin

D) Inside RBCs

B) Unattached in plasma

13. Most hormone secretion is controlled by:

A) Positive feedback

B) Negative feedback

C) Blood clotting

D) Osmosis only

B) Negative feedback

14. Which is a classic example of positive feedback?

A) Insulin secretion

B) Thyroid hormone regulation

C) Oxytocin during labor

D) Cortisol regulation

C) Oxytocin during labor

15. The hypothalamus controls the anterior pituitary primarily through the:

A) Coronary circulation

B) Hypophyseal portal system

C) Pulmonary circuit

D) Hepatic portal system

B) Hypophyseal portal system

16. Which anterior pituitary hormone stimulates the thyroid gland?

A) TSH

B) ACTH

C) FSH

D) ADH

A) TSH

17. ACTH primarily stimulates the:

A) Thyroid gland

B) Adrenal cortex

C) Pancreas

D) Pineal gland

B) Adrenal cortex

18. Which hormone stimulates follicle development in females and sperm production in males?

A) FSH

B) TSH

C) ACTH

D) ADH

A) FSH

19. Which hormone triggers ovulation in females?

A) Prolactin

B) LH

C) TSH

D) ADH

B) LH

20. Prolactin primarily promotes:

A) Milk production

B) Milk ejection

C) Uterine contraction

D) Water reabsorption

A) Milk production

21. Oxytocin is responsible for:

A) Milk production only

B) Milk ejection and uterine contraction

C) Decreasing blood calcium

D) Raising blood glucose

B) Milk ejection and uterine contraction

22. ADH primarily acts on the:

A) Stomach

B) Collecting tubules of the kidneys

C) Thyroid

D) Testes

B) Collecting tubules of the kidneys

23. Which hormone helps regulate the sleep-wake cycle?

A) Melatonin

B) Insulin

C) Aldosterone

D) Glucagon

A) Melatonin

24. Which pancreatic hormone lowers blood glucose?

A) Glucagon

B) Insulin

C) Cortisol

D) Epinephrine

B) Insulin

25. Which pancreatic hormone raises blood glucose?

A) Insulin

B) Calcitonin

C) Glucagon

D) Melatonin

C) Glucagon

26. Blood is classified as which type of tissue?

A) Epithelial

B) Connective

C) Muscle

D) Nervous

B) Connective

27. Which is NOT one of the major functions of blood?

A) Transport

B) Regulation

C) Protection

D) Production of digestive enzymes

D) Production of digestive enzymes

28. Approximately what percentage of whole blood is plasma?

A) 25%

B) 45%

C) 55%

D) 75%

C) 55%

29. Approximately what percentage of whole blood consists of formed elements?

A) 10%

B) 25%

C) 45%

D) 65%

C) 45%

30. The percentage of blood volume occupied by RBCs is called the:

A) Hemoglobin

B) Hematocrit

C) Buffy coat

D) Plasma fraction

B) Hematocrit

31. The buffy coat consists mainly of:

A) RBCs only

B) Plasma proteins

C) WBCs and platelets

D) Albumin and fibrinogen

C) WBCs and platelets

32. The most abundant component of plasma is:

A) Protein

B) Water

C) Glucose

D) Sodium

B) Water

33. Which plasma protein is most important for maintaining blood osmotic pressure?

A) Albumin

B) Fibrinogen

C) Hemoglobin

D) Insulin

A) Albumin

34. Which plasma protein is important in blood clotting?

A) Albumin

B) Fibrinogen

C) Globin

D) Myosin

B) Fibrinogen

35. Which formed element is most numerous?

A) Platelets

B) WBCs

C) RBCs

D) Monocytes

C) RBCs

36. Mature red blood cells lack:

A) Hemoglobin

B) Plasma membrane

C) A nucleus

D) Cytoplasm

C) A nucleus

37. The primary function of hemoglobin is to transport:

A) Glucose

B) Oxygen

C) Hormones

D) Antibodies

B) Oxygen

38. Each hemoglobin molecule can carry a maximum of how many oxygen molecules?

A) 1

B) 2

C) 4

D) 8

C) 4

39. The average lifespan of a circulating RBC is approximately:

A) 10 days

B) 30 days

C) 120 days

D) 1 year

C) 120 days

40. Erythropoietin is primarily produced by the:

A) Liver

B) Kidneys

C) Spleen

D) Heart

B) Kidneys

41. Erythropoietin stimulates the production of:

A) Platelets

B) RBCs

C) Antibodies

D) Plasma proteins

B) RBCs

42. Blood cell formation is called:

A) Hemostasis

B) Hemopoiesis

C) Hemolysis

D) Agglutination

B) Hemopoiesis

43. In adults, most blood cell formation occurs in:

A) Yellow bone marrow

B) Red bone marrow

C) Cartilage

D) Lymph

B) Red bone marrow

44. Which cell is a precursor to both myeloid and lymphoid stem cells?

A) Platelet

B) Pluripotent stem cell

C) Neutrophil

D) Reticulocyte

B) Pluripotent stem cell

45. Which WBC is most strongly associated with bacterial phagocytosis?

A) Neutrophil

B) Basophil

C) Eosinophil

D) Lymphocyte

A) Neutrophil

46. Which WBC is especially important in fighting parasitic infections?

A) Monocyte

B) Eosinophil

C) Basophil

D) Neutrophil

B) Eosinophil

47. Which WBC releases histamine and heparin?

A) Basophil

B) Neutrophil

C) Lymphocyte

D) Monocyte

A) Basophil

48. Monocytes can differentiate into:

A) Platelets

B) Macrophages

C) RBCs

D) Plasma proteins

B) Macrophages

49. Platelets are best described as:

A) Complete cells with nuclei

B) Cell fragments

C) Plasma proteins

D) Lymphocytes

B) Cell fragments

50. A person with type A blood has:

A) A antigen and anti-B antibodies

B) B antigen and anti-A antibodies

C) Both antigens and no antibodies

D) No antigens

A) A antigen and anti-B antibodies

51. A person with type AB blood has:

A) No A or B antigens

B) Both A and B antigens

C) Only A antigen

D) Only B antigen

B) Both A and B antigens

52. In an RBC transfusion, type O blood is often called the:

A) Universal recipient

B) Universal donor

C) Rh donor

D) Plasma donor

B) Universal donor

53. Rh-positive blood means the RBCs:

A) Lack Rh antigen

B) Have Rh antigen

C) Lack hemoglobin

D) Contain anti-Rh antibodies

B) Have Rh antigen

54. Agglutination during an incompatible transfusion refers to:

A) RBC production

B) RBC clumping

C) Platelet formation

D) Plasma dilution

B) RBC clumping

55. The final meshwork that stabilizes a blood clot is formed by:

A) Albumin

B) Fibrin

C) Globulin

D) Hemoglobin

B) Fibrin

56. The heart is located primarily in the:

A) Abdominal cavity

B) Mediastinum

C) Pelvic cavity

D) Cranial cavity

B) Mediastinum

57. About two-thirds of the heart lies:

A) Right of the midline

B) Left of the midline

C) Above the clavicles

D) Below the diaphragm

B) Left of the midline

58. The pointed inferior portion of the heart is the:

A) Base

B) Apex

C) Septum

D) Hilum

B) Apex

59. The outermost layer of the heart wall is the:

A) Endocardium

B) Myocardium

C) Epicardium

D) Fibrous pericardium

C) Epicardium

60. The thick muscular layer of the heart wall is the:

A) Epicardium

B) Myocardium

C) Endocardium

D) Serous pericardium

B) Myocardium

61. The layer lining the chambers of the heart is the:

A) Endocardium

B) Myocardium

C) Epicardium

D) Fibrous pericardium

A) Endocardium

62. The fibrous pericardium primarily:

A) Produces blood

B) Prevents overstretching and anchors the heart

C) Conducts impulses

D) Pumps blood

B) Prevents overstretching and anchors the heart

63. Pericardial fluid primarily functions to:

A) Increase friction

B) Reduce friction

C) Increase blood pressure

D) Generate heart sounds

B) Reduce friction

64. Which chamber receives blood from the superior and inferior venae cavae?

A) Left atrium

B) Right atrium

C) Left ventricle

D) Right ventricle

B) Right atrium

65. Blood flows from the right atrium into the right ventricle through the:

A) Mitral valve

B) Tricuspid valve

C) Aortic valve

D) Pulmonary valve

B) Tricuspid valve

66. Blood leaves the right ventricle through the:

A) Aortic valve

B) Pulmonary semilunar valve

C) Mitral valve

D) Tricuspid valve

B) Pulmonary semilunar valve

67. Oxygenated blood from the lungs returns to the heart through the:

A) Pulmonary arteries

B) Pulmonary veins

C) Venae cavae

D) Coronary sinus

B) Pulmonary veins

68. Blood flows from the left atrium to the left ventricle through the:

A) Tricuspid valve

B) Pulmonary valve

C) Mitral valve

D) Aortic valve

C) Mitral valve

69. Blood leaves the left ventricle through the:

A) Pulmonary trunk

B) Aorta

C) Superior vena cava

D) Coronary sinus

B) Aorta

70. Which chamber has the thickest myocardium?

A) Right atrium

B) Left atrium

C) Right ventricle

D) Left ventricle

D) Left ventricle

71. The left ventricle has a thicker wall because it must:

A) Pump blood only to the lungs

B) Pump blood through systemic circulation

C) Receive venous blood

D) Produce electrical impulses

B) Pump blood through systemic circulation

72. Chordae tendineae and papillary muscles help prevent:

A) Semilunar valve opening

B) AV valve prolapse

C) Atrial contraction

D) Blood entering coronary arteries

B) AV valve prolapse

73. Which structure is the natural pacemaker of the heart?

A) AV node

B) SA node

C) Bundle branches

D) Purkinje fibers

B) SA node

74. What is the correct conduction pathway?

A) AV node → SA node → Purkinje fibers → AV bundle

B) SA node → AV node → AV bundle → bundle branches → Purkinje fibers

C) Purkinje fibers → SA node → AV node

D) SA node → Purkinje fibers → AV node

B) SA node → AV node → AV bundle → bundle branches → Purkinje fibers

75. The delay at the AV node allows:

A) Ventricles to contract before atria

B) Atria to finish contracting before ventricles

C) Blood to bypass the atria

D) Semilunar valves to remain closed permanently

B) Atria to finish contracting before ventricles

76. On an ECG, the P wave represents:

A) Ventricular depolarization

B) Atrial depolarization

C) Ventricular repolarization

D) Atrial repolarization only

B) Atrial depolarization

77. The QRS complex represents:

A) Atrial depolarization

B) Ventricular depolarization

C) Ventricular repolarization

D) SA node firing only

B) Ventricular depolarization

78. The T wave represents:

A) Ventricular repolarization

B) Atrial depolarization

C) Ventricular depolarization

D) AV node delay

A) Ventricular repolarization

79. The long refractory period of cardiac muscle prevents:

A) Blood flow

B) Tetanic contraction

C) Depolarization

D) ATP formation

B) Tetanic contraction

80. The right side of the heart pumps blood through the:

A) Systemic circuit

B) Pulmonary circuit

C) Coronary circuit only

D) Hepatic portal circuit

B) Pulmonary circuit

81. The left side of the heart pumps blood through the:

A) Pulmonary circuit

B) Systemic circuit

C) Renal circuit only

D) Coronary sinus

B) Systemic circuit

82. The myocardium receives oxygenated blood from the:

A) Pulmonary arteries

B) Coronary arteries

C) Venae cavae

D) Coronary sinus

B) Coronary arteries

83. The coronary sinus drains directly into the:

A) Left atrium

B) Right atrium

C) Left ventricle

D) Aorta

B) Right atrium

84. A myocardial infarction occurs when:

A) Blood flow to cardiac muscle is blocked long enough to cause tissue death

B) Heart rate temporarily rises

C) A valve opens normally

D) An atrium depolarizes

A) Blood flow to cardiac muscle is blocked long enough to cause tissue death

85. Increased venous return generally causes stroke volume to:

A) Decrease

B) Increase

C) Stop

D) Remain permanently unchanged

B) Increase

86. Increased arterial pressure creates greater:

A) Preload

B) Afterload

C) Venous return

D) Heart rate

B) Afterload

87. Sympathetic stimulation generally causes heart rate to:

A) Decrease

B) Increase

C) Stop

D) Become zero

B) Increase

88. Parasympathetic stimulation of the heart generally causes heart rate to:

A) Increase

B) Decrease

C) Double

D) Remain unchanged

B) Decrease

89. Arteries are defined as vessels that carry blood:

A) Toward the heart

B) Away from the heart

C) Only oxygenated blood

D) Only deoxygenated blood

B) Away from the heart

90. Veins are defined as vessels that carry blood:

A) Away from the heart

B) Toward the heart

C) Only oxygenated blood

D) Only through the lungs

B) Toward the heart

91. Which blood vessels are the major sites of exchange between blood and tissues?

A) Arteries

B) Veins

C) Capillaries

D) Aorta

C) Capillaries

92. What is the correct vessel sequence?

A) Vein → artery → capillary

B) Artery → arteriole → capillary → venule → vein

C) Capillary → artery → arteriole → vein

D) Arteriole → artery → vein

B) Artery → arteriole → capillary → venule → vein

93. The innermost layer of a blood vessel is the:

A) Tunica interna

B) Tunica media

C) Tunica externa

D) Myocardium

A) Tunica interna

94. The tunica media contains mainly:

A) Skeletal muscle

B) Smooth muscle

C) Cardiac muscle

D) Adipose tissue

B) Smooth muscle

95. Vasoconstriction causes the vessel lumen to:

A) Increase in diameter

B) Decrease in diameter

C) Disappear permanently

D) Fill with lymph

B) Decrease in diameter

96. Vasodilation causes the vessel lumen to:

A) Decrease

B) Increase

C) Close completely

D) Become rigid

B) Increase

97. Arterioles are especially important for regulating:

A) Blood cell production

B) Blood flow into capillary beds

C) Antibody production

D) Urine storage

B) Blood flow into capillary beds

98. Precapillary sphincters regulate:

A) Blood flow through capillaries

B) Heart conduction

C) Lymph production

D) RBC lifespan

A) Blood flow through capillaries

99. Elastic arteries are important because they:

A) Contain valves

B) Stretch during systole and recoil during diastole

C) Exchange gases directly

D) Produce RBCs

B) Stretch during systole and recoil during diastole

100. Which vessel type generally contains valves to prevent backflow?

A) Arteries

B) Veins

C) Capillaries

D) Arterioles

B) Veins