Search results for: reproductive system
The Reproductive System – How Gonads Go: Crash Course Biology #134
Hank lets us in on the meaning of life, at least from a biological perspective – it’s reproduction, which answers the essential question of all organisms: how do I make more of myself? So, sex, how does it work? References http://www.sciencemag.org/content/281/5385/1979 http://www.medicinenet.com/miscarriage/article.htm http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1559814/) Campbell Biology, 9th ed.
Read MoreReproductive System, Part 4 – Pregnancy & Development: Crash Course Anatomy & Physiology #43
We’ve reached the grand finale of our four-part series on human reproduction: BABIES! Today Hank walks you through the stages of pregnancy, beginning with how a zygote develops into blastomeres to a morula to a blastocyst, and finally to an embryo and a fetus. He also explains some of the amazing anatomical changes that take…
Read MoreReproductive System, Part 3 – Sex & Fertilization: Crash Course Anatomy & Physiology #42
After weeks of discussion of human reproduction, today we arrive at the main event: THE SEX. Hank explains the four phases of the human sexual response, how a sperm finds and fertilizes an egg, creating a zygote, and how different types of contraception work to prevent that from happening. Pssst… we made flashcards to help…
Read MoreReproductive System, Part 2 – Male Reproductive System: Crash Course Anatomy & Physiology #41
Our month-long exploration of human reproduction continues with a look at testicular anatomy, the steps of sperm production, and how it’s influenced by gonadotropin and testosterone. Hank also explains how sperm mature, and how they leave the body on a tide of glandular secretions during ejaculation. Pssst… we made flashcards to help you review the…
Read MoreReproductive System, Part 1 – Female Reproductive System: Crash Course Anatomy & Physiology #40
Human reproduction is complicated and important, and it’s going to take a four-part series for us to cover it. Today, we’re kicking that off with the female reproductive system, starting with how sex hormones affect oogenesis and ovulation, continuing through how the ovarian and menstrual cycles mature and release oocytes, and creating a comfy uterine…
Read MoreThe Reproductive Lives of Nonvascular Plants – Alternation of Generations: Crash Course Biology #136
Hank introduces us to nonvascular plants – liverworts, hornworts & mosses – which have bizarre features, kooky habits, and strange sex lives. Nonvascular plants inherited their reproductive cycle from algae, but have perfected it to the point where it is now used by all plants in one way or another and has even left traces…
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