CSS - PMS - CCE - PCS - General Science
Organs
Which organ produces the hormone renin as part of blood pressure regulation?
A. Kidney
B. Liver
C. Spleen
D. Pancreas
Correct Answer: A
Juxtaglomerular cells of the kidney secrete renin, initiating the renin-angiotensin system.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ receives feces immediately before defecation?
A. Rectum
B. Stomach
C. Jejunum
D. Gallbladder
Correct Answer: A
The rectum stores feces before their elimination through the anal canal.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ contains the ileocecal valve at its junction with another digestive segment?
A. Small intestine
B. Stomach
C. Esophagus
D. Gallbladder
Correct Answer: A
The ileocecal valve lies between the terminal ileum and cecum.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ contains the pyloric sphincter?
A. Stomach
B. Kidney
C. Liver
D. Heart
Correct Answer: A
The pyloric sphincter regulates passage of stomach contents into the duodenum.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ has a major role in both mechanical and chemical digestion?
A. Stomach
B. Spleen
C. Bladder
D. Thymus
Correct Answer: A
The stomach mechanically churns food and chemically digests it with acid and enzymes.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ uses peristalsis to move food toward the stomach?
A. Esophagus
B. Trachea
C. Ureter
D. Aorta
Correct Answer: A
Coordinated smooth muscle contractions called peristalsis move food through the esophagus.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ contains cardiac muscle tissue?
A. Heart
B. Liver
C. Kidney
D. Lung
Correct Answer: A
Cardiac muscle is a specialized involuntary muscle found in the heart.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ contains alveoli as its functional gas-exchange units?
A. Lung
B. Kidney
C. Liver
D. Pancreas
Correct Answer: A
Alveoli are microscopic air sacs where pulmonary gas exchange occurs.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ's main functional filtering units are nephrons?
A. Kidney
B. Lung
C. Liver
D. Spleen
Correct Answer: A
Each kidney contains numerous nephrons that filter blood and form urine.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ's main functional cells are hepatocytes?
A. Liver
B. Kidney
C. Lung
D. Heart
Correct Answer: A
Hepatocytes are the principal functional cells of the liver.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ is directly connected to the duodenum by the common bile duct system?
A. Gallbladder and liver
B. Spleen only
C. Kidney only
D. Heart only
Correct Answer: A
Bile from the liver and gallbladder reaches the duodenum through the biliary ducts.
CSS - PMS - CCE - PCS - General Science
Organs
The hepatic portal vein carries nutrient-rich blood mainly from digestive organs to which organ?
A. Liver
B. Heart
C. Kidney
D. Lung
Correct Answer: A
The hepatic portal vein transports nutrient-rich blood from the gastrointestinal tract to the liver.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ receives blood from both the hepatic artery and portal vein?
A. Liver
B. Kidney
C. Heart
D. Spleen
Correct Answer: A
The liver has a dual blood supply from the hepatic artery and hepatic portal vein.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ cannot normally regenerate lost neurons to the same extent as skin or liver tissue?
A. Brain
B. Skin
C. Liver
D. Bone marrow
Correct Answer: A
Most mature central nervous system neurons have very limited regenerative capacity.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ has the greatest capacity for regeneration after partial surgical removal?
A. Liver
B. Heart
C. Brain
D. Spleen
Correct Answer: A
The liver has a remarkable ability to regenerate after partial loss of tissue.
CSS - PMS - CCE - PCS - General Science
Organs
Which of the following organs is normally paired in males?
A. Prostate
B. Testes
C. Penis
D. Urinary bladder
Correct Answer: B
Males normally have two testes.
CSS - PMS - CCE - PCS - General Science
Organs
Which of the following organs is normally paired in females?
A. Uterus
B. Ovary
C. Bladder
D. Pancreas
Correct Answer: B
Females normally have two ovaries.
CSS - PMS - CCE - PCS - General Science
Organs
Which of the following is normally an unpaired organ?
A. Kidney
B. Lung
C. Ovary
D. Liver
Correct Answer: D
The liver is a single, unpaired organ.
CSS - PMS - CCE - PCS - General Science
Organs
Which of the following organs is normally paired?
A. Liver
B. Spleen
C. Kidneys
D. Pancreas
Correct Answer: C
Humans normally have two kidneys, one on each side of the vertebral column.
CSS - PMS - CCE - PCS - General Science
Organs
Which organ contains the sinoatrial node, the natural pacemaker of the body?
A. Heart
B. Brain
C. Lung
D. Kidney
Correct Answer: A
The sinoatrial node is located in the right atrium of the heart and initiates the normal heartbeat.