Alfred Ajibola
- 14th December, 2022 @ 09:41 AM
Topics in Biology
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 characteristics Concept of ecological pyramid Hindbrain: Medulla Oblongata and its features Food web explained with examplesAcademic 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?
Apart from the testicles, other male reproductive structures found in the scrotum include the epididymis, vas deferens, spermatic cord and cremaster muscle.
Please read an introduction to the scrotum and testicles here.
The epididymis is a comma-shaped, long, narrow and highly convoluted or coiled tubule. It has a length of 6 to 7 meters and can be seen on the superior, lateral and posterior sides of each testis. It is shown in the image below:
You can read on seminal vesicles and bulbourethral glands here.
The epididymis is a muscular tube that connects each testicle to the vas deferens via the ductuli efferentes testis. It is divided into 3 parts. These are:
Head of the epididymis
Body of the epididymis
Tail of the epididymis
The head of the epididymis receives sperm cells from the ductuli efferentes testis. Its walls comprises of a thick epithelium and a few smooth muscle. Functionally, the head of the epididymis absorbs fluid from the spermatozoa (sperm cells), mildly concentrating them in the process.
The body of the epididymis is made up of an epithelium and smooth muscle with intermediate thickness. Its contractions propels the spermatozoa downwards.
The tail of the epidermis has the thinnest epithelium. In comparison to other parts of the epididymis, it has the greatest quantity of smooth muscle. Sperm cells are moved into the vas deferens from here.
The epididymis generally serves the following functions:
It stores sperm for about 80 days, bringing them to maturity.
It improves sperm motility by absorbing some of the fluids produced by the testicles during sperm formation.
The epididymis protects the sperm cells.
The epididymis leads into another tubule called the vas deferens. The smooth muscles surrounding the epididymis aid in propelling sperm into the vas deferens via their contractions.
You can read on the male external genitalia (penis) here.
The vas deferens is found both within and above the scrotum. It is a long muscular tube that begins at the tail of the epididymis and runs through the ejaculatory ducts.
The contraction of the smooth muscles of the vas deferens helps in propelling sperm during ejaculation. Also, as sperm move from the vas deferens into the urethra, secretions are added into it from the male accessory sex glands.
Please read on the male accessory sex organs here.
The vas deferens is also called the ductus deferens.
The function of vas deferens is to move or transport sperm from the epididymis into the ejaculatory ducts during the process of ejaculation. Simply put, you can consider the vas deferens as the transport system responsible for sperm movement from the epididymis to the ejaculatory ducts.
This is a cord-like structure formed by the vas deferens. It plays an important role in the supply of blood to the testes and vas deferens. It also aids the movement of sperm out of the epididymis into the ejaculatory ducts.
Below is an image showing the contents of the spermatic cord:
The spermatic cord contains a large amount of blood vessels and nerves. Functionally, these vessels supply blood to the testes, epididymis and cremaster muscles while its nerves assist in transferring information back and forth from the scrotum, testicles and the cremaster muscles respectively.
You can read on the red blood cells here.
Permanently swollen veins (called varicose veins) may be formed in the vessels of the spermatic cord, resulting to a condition termed varicocele. In most cases, varicocele is asymptomatic, although fertility issues may result seldomly in patients.
The cremaster muscle surrounds the testis and is found only in males. They help in the movement of the testicles towards the body and away from it. The goal of these movements is to achieve an ideal temperature for sperm formation.
Unlike other internal organs, recall that the testes aren't located inside the body. It sits comfortably inside the scrotum, with the latter located outside the body. The temperature of the testis inside the scrotum is crucial for sperm formation. In fact, it is the cremasater muscle the moves the scrotum towards or away from the body, depending on the external temperature.
In comparison to the internal body temperature of 36.5oC, understand that both testes requires a slightly cooler temperature (around 34oC) for sperm formation.
In an environment with a cooler temperature, the cemaster muscle contracts, moving the testes towards the body. In this manner, the scrotal temperature is slightly raised against the environmental temperature. Conversely, when the environmental temperature is warmer, the cremaster muscle relaxes, thus pushing the testes away from the body.
Please read on homeostasis here.
The concept of the cremasteric reflex refers to an immediate action taken by the cremaster muscle whenever the inner thigh is stimulated. In this regard, the cremaster muscle automatically raises the testes towards the body. The inner thigh in the above instance refers to a region between the medial part of the hip and knee.
You can read on bones of the human skeleton here.
Kindly share this article via the links below:
Click here to read on Len Academy Smart School Software. Contact Alfred for a standard website at an affordable price
Please click here to follow Len Academy on Google News.
Please Register here or Login here to contribute to this topic by commenting in the box below.
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:
Len Academy