Problem 6 How is oxygen carried in the blo... [FREE SOLUTION]

Chapter 9: Problem 6

How is oxygen carried in the blood?

Short Answer

Expert verified

Oxygen is carried in the blood via hemoglobin, a molecule in red blood cells. Hemoglobin binds to oxygen molecules when they enter the blood from lungs and carries them to cells throughout body. Once they reach a cell requiring oxygen, the oxygen is released from hemoglobin, and it diffuses into the cell.

Step by step solution

Circulatory System Overview

Understand that the circulatory system is responsible for transporting nutrients, hormones, and gases like oxygen and carbon dioxide around the body. Oxygen enters the body through the respiratory system, particularly the lungs.

Oxygen and Red Blood Cells

Recognize that once oxygen enters the lungs, it gets diffused or passed into the blood. Here, it gets picked up by red blood cells. To be specific, each red blood cell contains a molecule called hemoglobin.

Role of Hemoglobin

Understand that hemoglobin has a special affinity or liking for oxygen. In the presence of oxygen, hemoglobin molecules in red blood cells bind to the oxygen molecule creating oxyhemoglobin.

Oxygen Transportation

With oxygen bound to hemoglobin, oxygen then travels throughout the body via the bloodstream. Once it reaches a cell that needs oxygen, the oxygen molecule is released from the hemoglobin molecule and diffuses into the cell.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Circulatory System

The circulatory system is like a vast network of highways in your body, responsible for the transportation of essential substances such as nutrients, hormones, and gases. Among these gases, oxygen is crucial as it powers the functioning of cells. This system works in harmony with the respiratory system.
When you breathe in, oxygen enters your body through the lungs. From there, it finds its way into the bloodstream, ready to begin its journey to every corner of the body. The heart acts as a pump in this system, continually circulating blood, and thus oxygen, to meet the demands of your cells.
Key components of the circulatory system include:

The heart - which pumps blood.
Blood vessels - like arteries and veins that transport blood.
The blood - which carries cells and essential substances.

Red Blood Cells

Red blood cells are like bee workers in a hive, continuously ferrying oxygen from the lungs to various tissues across your body. They are uniquely designed for this task, with a disc-like shape that increases their surface area and flexibility, allowing them to navigate through the tiniest blood vessels.
These cells are abundant in your bloodstream and are produced in the bone marrow. But what makes them truly special is the presence of hemoglobin, a critical protein that binds oxygen. This ensures efficient oxygen transport, making red blood cells indispensable in the body's oxygen delivery system.
Vital points about red blood cells:

They have a lifespan of about 120 days.
Lack a nucleus, which makes room for more hemoglobin.
Facilitate the removal of carbon dioxide from tissues.

Hemoglobin

Hemoglobin is the superstar protein found within red blood cells. It has a remarkable capacity to bind with oxygen, thanks to its four iron-containing heme groups. Each hemoglobin molecule can latch onto four oxygen molecules at a time, forming oxyhemoglobin, a bright red compound that indicates oxygen-rich blood.
This binding is essential because it allows oxygen to be efficiently transported throughout the circulatory system. When blood reaches tissues in need of oxygen, hemoglobin releases its oxygen load, ensuring cells receive the fuel they need to function.
Essential features of hemoglobin:

Gives red blood cells their color.
Reacts with oxygen and carbon dioxide reversibly.
Aids in maintaining the pH balance in the blood.

Oxygen Diffusion

Oxygen diffusion is a process akin to spreading butter on bread evenly鈥攚here oxygen moves from an area of high concentration, like the lungs, into the bloodstream where its concentration is lower. This movement is critical for ensuring a steady supply of oxygen from the lungs to our cells.
Diffusion doesn't stop at getting oxygen to the blood. It plays a crucial role once the blood reaches tissues. Here, oxygen concentrations once again guide its movement, diffusing from the blood into cells hungry for oxygen to sustain metabolism.
Key factors influencing oxygen diffusion:

Concentration gradient between the lungs and the blood.
Permeability of the cell membranes.
Surface area available for diffusion in the alveoli of lungs.

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How is oxygen carried in the blood?

Short Answer

Step by step solution

Circulatory System Overview

Oxygen and Red Blood Cells

Role of Hemoglobin

Oxygen Transportation

Key Concepts

Circulatory System

Red Blood Cells

Hemoglobin

Oxygen Diffusion

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