Topics in Biology
Male Reproductive System: External and Internal Male Genitals Male accessory sex organs Food Chain, Food Web and Food Pyramid Skeleton and Type of Skeletal Materials Bones - Types of Bone Bones and Type of Bone part 2 Red Blood Cells and Hemoglobin Tropical Rainforest and Savanna with their characteristics Desert and Swamp Forest - Types of Desert, Characteristics of Deserts and Swamps Plant Nutrition and Photosynthesis - Autotrophic mode of Nutrition Amazing facts in Biology Protists - Examples and Characteristics of Protists Reptiles - Characteristics of Reptiles Homeostasis and Negative Feedback Mechanism Arteries, Layers of an Artery and Characteristics of Arterial Disorders Introduction to Biology - Basic Characteristics of LifeAcademic Questions in Biology
The living cells that makes up cartilages are called _____.
Which of the following statement is incorrect with regards to chitin?
Which of the following is NOT a function of the human skeleton?
Organisms that manufacture their own food through the help of sunlight or chemicals are best referred to as _____.
Organisms that begins a food chain and also manufacture their food through photosynthesis are best referred to as _____.
_____ bones make up the skull.
Chemical digestion of carbohydrate (cooked starch) begins in the _____.
When we reflect on some of the necessities of life, oxygen (O2) will definitely rank among the top.
Although oxygen makes up about 21% of the atmosphere, it is still enough to make earth a livable planet for its different inhabitant.
Please read on Layers and Composition of the Atmosphere here.
In humans, without the red blood cell and hemoglobin, atmospheric oxygen will be considered a waste because the various bodily cells, tissues and organs will not be able to utilize it for respiration.
Note: Breathing and respiration is NOT the same thing.
Breathing is simply when one inhales and exhales air.
Everytime we breathe, oxygen is inhaled while carbon(IV)oxide is exhaled.
Respiration is the use of oxygen to break down food in order to generate energy in the form of ATP.
ATP stands for Adenosine Tri Phosphate.
In order to make our explanation a little bit simpler, we will look at some of the facts pertaining the red blood cells and hemoglobin.
Below are some of these facts:
The red blood cell can also be referred to as an erythrocyte.
The red blood cells are one of the solid components of the blood; the others being white blood cells and platelets.
Note: Blood is actually a mixture of liquid (called plasma) and solid (called cells). Based on this fact, a blood can be dried and grounded to form a blood meal.
Please read on how a mixture of Blood can be Separated into its various components here.
An average human being produces up to 2.5 million red blood cells per second.
Ordinarily, the blood is light/pale yellow in color. It is the red blood cells that actually give the blood its red coloration.
The red blood cell has the shape of a biconcave disc with a thickness of 2.5 micrometers at its edges and less than 1 micrometer at its center.
Image of Red Blood Cells
Image Credit: The Franklin Institute
The red blood cell is very flexible; and as a result, it can squeeze through blood capillaries by altering its shape without destroying itself.
Note: Capillaries are tiny and microscopic blood vessels that operate at the cellular level.
Think of a blood vessel as a pipe that carries blood within our body system.
The other blood vessels are the arteries and veins.
Read on the Layers of an Artery and Characteristics of Arterial Disorders here.
A mature red blood cell has NO nucleus. Instead, it contains hemoglobin within.
Some scientists are of the opinion that if the matured red blood cells had a nucleus, the nucleus would be damaged when the red blood cells attempt to pass through the blood capillaries. This damaged nucleus will result in the sudden death of the red blood cell.
Red blood cell has no DNA, RNA, mitochondria or any other organelle found in most cells. For this reason, it does not require energy to carry out its functions. This is true because the mitochondria (often referred to as power house of the cell) is absent.
In the early weeks of embryonic life, the red blood cells are produced in the yolk sac. They contain nucleus at this time.
During the 3rd to 8th months of pregnancy, the red blood cell is produced mainly in the liver.
The spleen and lymph nodes also produces some red blood cell during this period.
During the last month of pregnancy and after birth, the red blood cells are produced exclusively in the bone marrow.
After age 20, the long bones of the human body stop producing red blood cells.
Examples of long bones are humerus (bone of the arm) and femur (bone of the thigh).
During this period (after age 20), the red blood cells are now produced in the membranous bones.
Examples of membranous bones are the vertebrae, sternum and ribs.
The major function of the red blood cell is to transport hemoglobin. This implies that the hemoglobin is present inside the red blood cell.
It is the hemoglobin in the red blood cell that binds with oxygen to form oxyhemoglobin.
Note: The red blood cell has other functions too. For instance, they initiate the transport of CO2.
The transport of Carbon(IV)oxide by the hemoglobin is made possible because it contain an enzyme called carbonic anhydrase which catalyzes the reversible reaction between carbon(IV)oxide (CO2) and water (H2O) to form carbonic acid (H2CO3). It is in this form that CO2 is transported back to the lungs for expiration.
The red blood cells bind more strongly to carbon(II)oxide or carbon monoxide (CO) when compared to the rate at which oxygen binds to hemoglobin. This is why death is very rapid in carbon monoxide poisoning.
Red blood cells are red when hemoglobin (present within it) is combined with oxygen to form oxyhemoglobin.
They become blue after the oxygen had been delivered to the body cells.
An average man has 5,200,000 red blood cells per cubic millimeter of blood.
An average woman has 4,700,000 red blood cells per cubic millimeter of blood.
Erythropoietin is a hormone that stimulates the production of red blood cells.
Erythropoietin is produced in the kidneys and an increase in its production is trigged during hypoxia.
Note: Think of hypoxia as a condition where there is very little amount of oxygen in the blood; and as a result, the body tissues lack oxygen too.
Iron is vital in the formation of hemoglobin. This is why it is always present in blood capsules and often recommended for blood building.
The red blood cells have an average lifespan of 120 days after which they are destroyed by the liver and spleen respectively.
Anemia results when there is little or no hemoglobin in the blood.
Anemia will also occur when there are too few red blood cells in the blood.
Polycythemia is the presence of too many (excessive) red blood cells in the blood. This condition is seen in people that live in high altitude.
Note: The higher the altitude, the lower the atmospheric oxygen.
Polycythemia Vera (also called Erythremia) is when there are excessive red blood cells in the blood as a result of genetic aberration.
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Amazing facts in Biology
Male Seahorses actually give birth to their young ones, NOT the female
All babies are born with blue eyes
Research made at the University of Vienna suggested that yawning may play an essential role in cooling the brains
All voluntary and concious activity of right handed people are controlled from the left part or hemisphere of the brain
A snail can actually sleep for 3 years 😁
An adult human being is composed of about 60% water. In fact, a newly born baby is composed of about 80% of water. This will drop to 65% after a year and finally to about 60% as the child ages
Without saliva, food can never be enjoyed. Food becomes tasteless since saliva is needed to dissolve the chemicals present in food onto the tongue’s taste buds.
Saliva also contains an enzyme called salivary amylase or "ptyalin" which helps to digest cooked starch to maltose. Maltose is a double sugar or disaccharide. Please read on sugars here
NOTABLE POINTS IN Biology
During strenuous exercises like sprinting or 🏃 running, your body may actually work in the shortage of oxygen. During this time, your body owes oxygen (called oxygen debt) and it must be replenished or repayed after the exercise is stopped. This is why you breathe excess of oxygen after you stopped the exercise.
This is the concept of anaerobic respiration
A food Chain is a diagram that shows the relationship between plants and animals within a habitat on the basis of how they rely on each other for food.
Note: Habitat is a place where an organism live. It is of three types:
The term Biology originated from two Greek words. They are:
Biology can therefore be defined is the study of life
Anything that has life is generally considered as a living organism (or organism) 🌱🐐🐓. All living organisms must be able to carry the following activities:
The above listed points are often regarded as the basic characteristics of life. You can memorize them using the acronym (MR. NIGER DAC).
You can read on the introduction to Biology and the basic characteristics of life here
The gas used in the manufacture of food by plants is Carbon dioxide or Carbon(IV)oxide or CO2.
Plants manufacture food through a process called photosynthesis. Please read on photosynthesis here
Note: Plants are the only orgnisms that take away CO2 from the atmosphere
In the Biological organization of life, it is said that cells form tissues, tissues form organs and organs form systems. There are 12 systems in the human body; these are:
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