Biology Revision for "O" level examinations

 How does a female know that she is pregnant? A number if early signs are associated with pregnancy, and they usually appear within the first few weeks after conception. However, not all of these signs will be present in everyone. Some of these signs include: -   Missed menstrual period: Well, there are other reasons why a female can miss her period, but once a female is pregnant, then the walls of the uterus must remain intact, therefore, she will not have her period. -Implantation bleeding: this is a slight bleeding that occurs at the time of implantation of the embryo into the walls of the uterus. This can usually be observed about 10 to 14 days after implantation. -Tender, swollen breasts -Fatigue: This is because the hormone progesterone will rise significantly and in high doses, it will make the female feel sleepy. It also lowers blood pressure, and blood sugar levels -Constipation: the hormone progesterone can cause food to pass out more slowly t...

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Hello everyone. Please check out this free course on Reproduction. Before you enroll and view the contents, you would need to create an account on www.udemy.com                                                        Click here to view the course page                                                        Click here to view the course page I also have three paid courses on Udemy. Please check them out by clicking below: Genetics and Reproduction course

What is the Endocrine system? It is a collection of  glands  that secrete  chemical messages  called hormones. Gland: A  gland  is a group of cells that produces and secretes, or gives off, chemicals. Hormone: are chemicals that regulate or controls the activity of certain cells or organs The nervous system sends electrical messages to control and coordinate the body. The endocrine system has a similar job, but uses chemicals to “communicate” Endocrine system works more slowly than the Nervous system Hormones are released from glands/cells into the blood vessels They travel to target organs, where they cause a change  Endocrine vs Nervous system The nervous system sends electrical messages to control and coordinate the body. The endocrine system has a similar job, but uses chemicals to “communicate” Endocrine system works more slowly than the Nervous system Response of Nervous system is short lived, while response of Endocrine system...

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Hello everyone. Please check out this course that was made on the topic Reproduction. In this course, reproduction in plants and humans are examined. In addition, two lectures were included to explain the endocrine system. Click on this link below to check out the course :  Biology for O Level Examinations (CXC, GCSE): Reproduction