Topics in BiologyTropical savanna explained with its characteristics Ecological pyramid explained with its importance and limitations Hindbrain: Medulla Oblongata and its features Food web explained with examples Biology Scheme of Work, SS1, First Term Biology Scheme of Work, SS1, 2nd Term Biology Scheme of Work, SS1, 3rd Term Male accessory sex organs: Seminal vesicles and bulbourethral glands Scrotum and its contents: Testicles Brain: Introduction to the human brain Forebrain: Lobes of the cerebrum and their functions Cerebellum: Parts and functions of the cerebellum Midbrain: Division and functions of the midbrain Negative feedback mechanism in homeostasis Arterial disorders explained with their causes Types of desert and their characteristics Characteristics of tropical rainforest Swamp forest: What are swamp forests? Characteristics of swamp forests Savanna biome: Concept of the savanna
Academic Questions in Biology
In a food chain, the primary consumers are classified under trophic level _____.
Cold blooded animals are referred to as _____.
F. None of the above
All reptiles are vertebrates.
_____ 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?
A diagram showing the movement of energy through a food chain is called a _____.
Which of the following is NOT a part of the wrist bones (or carpal 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:
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.
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.
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.
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
99% of a panda's diet is bamboo. They may eat fish or other small animals occasionally
When attacked by insects, lima beans plant will often command parasitic wasps to their defence.
When the leaves of the lima bean's leaves are eaten by insects, the plant gives off a substance that signals parasitic wasps to swam in, destroying its enemies (the leaf-eating insects) in the process
Frogs drink water through their skin
Armadillos are western mammals known for their unique armor-like shell which are bulletproof
Although zebras are known for their characteristics black and white stripes, we still have some polka-dotted zebras
Charles Darwin is a British naturalist and biologist who contributed greatly into the study of evolution. According to research, he frequently ate the animals he studied
Lungs are the only human organ that can float on water
Unlike most snakes that lay eggs, anacondas give birth to live babies
A shrimp's heart is in its head
Women have more pain receptors than men
NOTABLE POINTS IN Biology
For a thing to be considered living, it must possess all the basic characteristics of life. These include:
Irritability or Sensitivity
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:
Bios: means life.
Logos: means knowledge or to study.
Biology can therefore be defined as 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:
Irritability or Sensitivity
The above listed points are often regarded as the basic characteristics of life. You can memorize them using the acronym -> MR. NIGER DAC.
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.
It is noteworthy to state that plants are the only orgnisms that take away CO2 from the atmosphere