Free Digestion MCQs with Answers
680 Digestion MCQs from Biology, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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Read the Digestion notesFree MDCAT chapter notes with key terms680 questions · page 21 of 34
- A. Pulmonary artery
- B. Right atrium
- C. Coronary artery
- D. Left atrium
Explanation: The heart muscle is nourished by coronary arteries. The coronary arteries are a network of blood vessels that supply oxygen-rich blood to…
Correct answer: Coronary artery- A. Renal Artery
- B. Femoral Artery
- C. Hepatic Artery
- D. Intercostal Arteries
Explanation: The femoral artery is the continuation of the external iliac artery. The external iliac artery is the main artery that supplies blood to…
Correct answer: Femoral Artery- A. Hepatic portal vein
- B. Femoral veins
- C. Pulmonary vein
- D. Renal vein
Explanation: Yes, that is correct. In humans, blood from the digestive tract, spleen, and pancreas is transported to the liver by the hepatic portal…
Correct answer: Hepatic portal vein- A. Pulmonary artery
- B. Pulmonary vein
- C. Coronary artery
- D. Hepatic artery
Explanation: The pulmonary veins are the only veins in the body that carry oxygenated blood.
Correct answer: Pulmonary vein- A. Bicuspid valve
- B. Tricuspid Valve
- C. Semilunar valve
- D. Interatrial Septum
Explanation: The right atrium is separated from the right ventricle by the tricuspid valve.
Correct answer: Tricuspid Valve406. The flaps of tricuspid valves are attached to muscular extension of of right ventricle known as :
- A. Smooth muscles
- B. Intercostal muscles
- C. Papilary muscle
- D. Skeletal muscle
Explanation: The flaps of the tricuspid valve are attached to muscular extensions of the right ventricle known as papillary muscles.
Correct answer: Papilary muscle- A. Endocardium
- B. Pericardium
- C. Myocardium
- D. Epicardium
Explanation: Yes, the closed sac which surrounds the heart in humans is the pericardium.
Correct answer: Pericardium- A. Cardiac end of stomach valve
- B. Pyloric sphincter of stomach
- C. Tricuspid valve of heart
- D. Eyelid
Explanation: The chordae tendineae are fibrous cords that attach the flaps of the tricuspid valve to the papillary muscles in the right ventricle of…
Correct answer: Tricuspid valve of heart- A. Right atrium to right ventricle
- B. Left ventricle to aorta
- C. Right ventricle to pulmonary artery
- D. Left atrium to left ventricle
Explanation: The bicuspid valve (also known as the mitral valve) controls the flow of blood from the left atrium to the left ventricle.
Correct answer: Left atrium to left ventricle- A. Left atrium
- B. Right atrium
- C. Left ventricle
- D. All are thick
Explanation: The left ventricle is the thicker chamber of the human heart. It is responsible for pumping oxygenated blood to the rest of the body.
Correct answer: Left ventricle- A. Atria
- B. Hepatic portal veins
- C. Coronary artery
- D. Ventricle
Explanation: Chordae tendineae are present in the ventricles of the heart.Chordae tendineae are fibrous cords that attach the flaps of the heart valves…
Correct answer: Ventricle- A. Pulmonary arteries
- B. Sinoatrial valve
- C. Bicuspid and tricuspid valves
- D. Septum
Explanation: The bicuspid and tricuspid valves control the one-way flow of blood from the atria to the ventricles.
Correct answer: Bicuspid and tricuspid valves- A. A.V valves close
- B. A.V valves open
- C. A. V valves open and semilunar valves close
- D. A. V valves close and semilunar valves open
Explanation: During atrial systole, the atria-ventricular valves remain open while semi-lunar valves remain close because the pressure gradient between…
Correct answer: A. V valves open and semilunar valves close- A. A.V valves open
- B. Semilunar valves open
- C. A.V valves open and semilunar valves close
- D. Both A.V and semilunar valves close
Explanation: At the end of ventricular systole, atrio-ventricular and semilunar valves close.
Correct answer: Both A.V and semilunar valves close- A. A.V valves open
- B. Semilunar valve close
- C. A.V valves close
- D. Semilunar valve open
Explanation: In healthy adults there are two normal heart sounds. often described as a lubb and dubb, that occur in sequence with each heartbeat.
Correct answer: A.V valves close- A. Closure of AV valves
- B. Opening of AV valves
- C. Closure of Semilunar valves
- D. Opening of semilunar valves
Explanation: During ventricle contraction two heart sounds produce, 1st sound is "Lubb" produced when AV-valves close while the 2nd heart sound is…
Correct answer: Closure of Semilunar valves- A. S.A node
- B. A.V node
- C. Battery
- D. Henson node
Explanation: The SA node is the heart's natural pacemaker. The SA node consists of a cluster of cells that are situated in the upper part of the wall…
Correct answer: S.A node- A. Bundle branch
- B. AV node
- C. Ventricle Muscles
- D. Atrial Muscles
Explanation: The atrioventricular node or AV node is a part of the electrical conduction system of the heart that coordinates the top of the heart.
Correct answer: AV node- A. AV Node
- B. SA Node
- C. SV Node
- D. PQ Node
Explanation: The SA node is the heart's natural pacemaker. The SA node consists of a cluster of cells that are situated in the upper part of the wall…
Correct answer: SA Node- A. Blood pressure
- B. Electrical Events
- C. Mechanical Events
- D. Chemical Events
Explanation: ECG is a test to check electrical events of heart that is determined by the electrodes placing on body.
Correct answer: Electrical Events