Where is most red marrow found in adults?

Flat bones such as the pelvis, sternum and vertebrae

Bone Marrow Quiz: How Your Body Makes New Blood Cells

Soft tissue hidden inside bones quietly replaces the blood you lose every day, and this bone marrow quiz explains how. Play 10 interactive questions on red and yellow marrow, hematopoiesis, stem cells, where marrow is in adults, red cell lifespan, erythropoietin, marrow biopsies, the first successful transplants, donor registries and babies' marrow.

Start Bone Marrow Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Process
What is the making of blood cells called?
Red
What does red bone marrow do?
Yellow
What is yellow marrow mainly made of?
Stem
Which cells give rise to all blood cells?
Adults
Where is most red marrow found in adults?
Babies
What is true of newborns' marrow?
Lifespan
How long do red blood cells usually live?
Hormone
Which kidney hormone boosts red cell production?
Transplant
Who won a Nobel Prize for pioneering bone marrow transplants?
Biopsy
From which bone is a marrow sample often taken?

Explanations: answer key for all 10 questions

Q1: What is the making of blood cells called?
Answer: Hematopoiesis
It happens mainly in marrow.
Q2: What does red bone marrow do?
Answer: Produces blood cells
It is rich in blood vessels.
Q3: What is yellow marrow mainly made of?
Answer: Fat
It can convert to red in emergencies.
Q4: Which cells give rise to all blood cells?
Answer: Hematopoietic stem cells
They divide and mature.
Q5: Where is most red marrow found in adults?
Answer: Flat bones such as the pelvis, sternum and vertebrae
Long bones turn mostly yellow.
Q6: What is true of newborns' marrow?
Answer: Nearly all of it is red
Growth needs many blood cells.
Q7: How long do red blood cells usually live?
Answer: About 120 days
Marrow constantly replaces them.
Q8: Which kidney hormone boosts red cell production?
Answer: Erythropoietin
Low oxygen triggers its release.
Q9: Who won a Nobel Prize for pioneering bone marrow transplants?
Answer: E. Donnall Thomas
He shared the 1990 prize.
Q10: From which bone is a marrow sample often taken?
Answer: The hip bone
The iliac crest is common.

Bone Marrow Quiz – How Your Body Makes New Blood Cells

Bone marrow is the soft tissue inside bones. Red marrow carries out hematopoiesis, the production of blood cells, from hematopoietic stem cells, while yellow marrow is mostly fat. Newborns have almost entirely red marrow.

In adults, red marrow is concentrated in flat bones such as the pelvis, sternum, ribs and vertebrae. It produces billions of cells every day, replacing red blood cells that live about 120 days. The kidney hormone erythropoietin boosts red cell production when oxygen is low.

Doctors often sample marrow from the hip bone. E. Donnall Thomas shared the 1990 Nobel Prize for pioneering bone marrow transplants, and donor registries now match patients with volunteers worldwide.

What This Quiz Teaches

Students and health fans will enjoy these questions.

What marrow does
Where it is found
Which cells it makes
How it is regulated
How transplants work

Did You Know?

Platelets and white blood cells also come from marrow.
Many donations now collect stem cells from blood.
Marrow transplants treat some leukemias.
Siblings are often the best donor match.
Fasting and illness can change marrow activity.