Alfred Ajibola
- Mon, 02nd March, 2020 @ 6:05 PM
Topics in Biology
Cellular respiration in biology Len Academy biology mock questions for waec Len Academy biology midterm questions for SS1, 2nd Term Characteristics of saltwater habitat Aquatic habitat explained with its types Types of habitat: Terrestrial habitat explained with examples What is habitat? Difference between plant cell and animal cell Nucleus explained with its structures Nucleus explained with its types and functions Organelles of the cell explained with their characteristics Eukaryotic cell explained with its characteristics Prokaryotic cell explained with its structure Characteristics of prokaryotic cell Concept of cell Cell theory in biology Importance and limitations of ecological pyramid Protists explained with their characteristics Contents of the scrotum: Epididymis, vas deferens, spermatic cord and cremaster muscle Tropical savanna explained with its characteristicsAcademic Questions in Biology
From the above diagram, which of the organ below isn't a requirement for the male reproductive system?
A. Bladder
B. Ureter
C. Glans Penis
D. Testis
E. Bulbourethral Gland
F. Epididymis
A walnut shaped male accessory sex organ located between the bladder and penis is the _____.
A. Ductus Ejaculatorii
B. Bulbourethral Gland
C. Prostate Gland
D. Ductus Deferens
E. Seminal Vesicles
F. Epididymis
In a food chain, the primary consumers are classified under trophic level _____.
A. Zero
B. One
C. Two
D. Three
E. Four
F. Five
Cold blooded animals are referred to as _____.
A. Homeotherms
B. Endotherms
C. Poilokitherms
D. Ectotherms
E. Thermotherms
F. None of the above
All reptiles are vertebrates.
A. True
B. False
_____ cells are responsible for the formation of osteoblasts.
_____ is a bone that constitute the axial skeleton.
Which of the following is false concerning cartilages and bones?
Semen produced by males require the active functions of the male accessory sex organs to become properly formed. In fact, without these accessory organs, sperms present within the semen may become unable to fertilize an ova or egg within the fallopian tube (or oviduct) of the female reproductive system.
To better comprehend the distinctions between semen and sperm, please read on the male reproductive system (scrotum and its contents) here.
The accessory male reproductive organs include the followings:
Please read on the male accessory sex organs (prostate glands and ejaculatory ducts) here.
The focus of this article will be on the seminal vesicles and and bulbourethral glands as male accessory sex organs:
A male has a pair of seminal vesicles (vesicula seminalis) located just above the prostrate gland; and posterior to the base of the urinary bladder. It is shown in the image below:
The main function of the seminal vesicle is to add viscous and alkaline secretions to the sperm already present in the ejaculatory ducts.
The secretions or fluid of the seminal vesicle does the following:
The seminal fluid is composed up of the followings:
This is a simple sugar utilized for Adenosine TriPhosphate (ATP) generation.
ATP is the energy essential for sperm motility. This is important because the sperms may swim upwards (against gravity) in the female reproductive tract.
For now, you can think of ATP as the energy currency of the body.
They reduce the negative effects of the female immune system that may act upon the sperm cells. This process increases the chances of a sperm's survival in the female reproductive tract.
Please read on immunization here.
This fluid creates a gel like structure around the sperm, thus protecting it. The appearance of semen is largely attributed to the viscosity of the semenogelin.
They are also called the Cowper’s gland.
The bulbourethral glands are two pea like shaped organs located just below the prostate gland and at the beginning (or root) of the penis.
Please read on male reproductive system (penis and parts of the penis) here.
The anatomical position of the bulbourethral glands are shown in the image below:
In addition to the prostate and seminal fluids, the bulbourethral glands also secrete fluid into the semen during the process of ejaculation. The fluid from the bulbourethral glands serve the following functions:
Note: Although the urethra isn't considered a part of the male accessory reproductive gland, it still performs a vital role in the male reproductive system.
You can read an introduction to the human brain here.
Below is a summarized explanation on the urethra:
The male urethra is a single tube-like structure that serves two functions. These are:
In males, the urethra is a narrow fibro-muscular tube that conducts urine from the bladder to the exterior. It also conducts semen from the ejaculatory ducts to the exterior. It is shown below:
The conduction on urine and semen through the urethra does not occur simultaneously.
The male urethra is about 7 to 8 inches in length; and it runs through the prostate gland, seminal vesicles and the entire length of the penis before emptying its content to the exterior.
The urethra has three sections. These are:
Prostatic Urethra: This is the uppermost portion of the urethra. It lies inside the prostate gland.
Membranous Urethra: This is the segment within the urethral sphincter. It is important to state that urine or semen can only come out singly (one at a time); and that's when the membranous urethra is opened.
Spongy or Penile Urethra: This is the lowest and longest section of the urethra. It lies within the entire length of the penis, leading to the exterior. (Please see the image above).
Note: The exterior opening of the urethra is also called the external urethral orifice or meatus.
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Amazing facts in Biology
Russia is home to the largest area of forest in our world with a land mass of 815 million hectares
Giant squid lives deep in the ocean and they have the largest eyes in the world
The movements of the fingers are controlled by muscles of the palms and forehands
Platypus (sometimes referred to as the duck-billed platypus) is an egg-laying, semiaquatic mammal found in eastern Australia. It has no stomach and as such, its food goes from the mouth through the esophagus and directly to their intestines.
Pufferfish contain a toxin called tetrodotoxin. This makes them foul tasting and poisonous to predators. Tetrodotoxin is about 1,200 times more poisonous than cyanide, and there is enough toxin in one pufferfish to kill 30 adult humans. Unfortunately, there isn't any known antidote to this poison.
Interestingly, a delicacy in Japan (called fugu) is made from pufferfish. This meal is very expensive, and must be prepared by trained and licensed chefs. An improper preparation of fugu may lead to the customer's death. Sadly, such deaths are recorded annually
Wombats are the only animal with a cube-shaped poo. They can stack up these cube-shaped poo, marking their territory with it
Robert Wadlow (1918–1940) remains the tallest man ever recorded in the Guinness World Records. He was an American who stood at 8 feet, 11 inches.
An abnormally enlarged pituitary gland had resulted into Robert Wadlow's giant size.
Cockroach is the fastest land animal on six legs
Like humans, all apes laugh when tickled
An ostrich's eye is bigger than its brain
Notable points in Biology
An artery is composed of three layers:
The outermost layer is termed tunica adventitia (or tunica external). It consist mainly of collagen fibres and connective tissues that anchors the arteries to other nearby tissues.
The middle layer is named tunica media. It is made up of smooth muscles and elastic fibres that supports the artery in conveying blood at high pressures.
The inner layer is called tunica intima (or tunica internal). It is lined by a smooth tissue called endothelium, and is made up of a fine network of connective tissues.
All living organisms possess various features in order to survive in their environment. This is the concept of adaptation. As an instance, a fish is able to live in water because it has gills and fins.
Also, a camel is able to survive in the desert because it has large feet to aid walking on sand without sinking. It also has long eyelashes to help protect it from the blowing sand and wind.
Plants are also able to live in different habitats because they have the required adaptive features towards that habitat. For instance:
Plants that live in/on water are termed hydrophytes.
Plants that live on land with moderate amount of water are termed mesophytes.
Plants that live on deserts or arid lands are termed xerophytes.
The point is:
All organisms have various features on them that enables them adapt in their habitat
For a thing to be considered living, it must possess all the basic characteristics of life. These include:
Movement
Respiration
Nutrition
Irritability or Sensitivity
Growth
Excretion
Reproduction
Death
Adaptation
Competition
Please read the explanations on all the basic characteristics of life here
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: