9: Week 9: The Human Body Biome - Biology

9: Week 9: The Human Body Biome

9 weeks pregnant: fetal development

See how your baby is developing at nine weeks of pregnancy.

Your baby's fingers are more distinct.

Your baby's arms bend at the elbows, and his legs now have ankles.

All your baby’s essential organs are in place (NHS 2018) , though they'll go through plenty of fine-tuning in the coming months. By now, his heart has finished dividing into four chambers (Moore et al 2019a, Visembryo nda) and his nose and sense of smell are developing (Hill 2019a, Moore et al 2019b, Visembryo nda) . Your baby's organs, muscles, and nerves are all kicking into gear.

With your baby's embryonic tail nearly gone (Mukhopadhyay et al 2012) , he's starting to look a bit more human. By the end of this week, he'll measure about 2.3cm (0.9in) long and weigh about 2g (0.07oz) (Hill 2019b) . This is roughly the size of a grape.

Your baby's tiny ears are becoming more defined and will move into place soon (Hill 2019c, Moore et al 2019c, Visembryo ndc) . In his mouth, bulb-shaped buds in his gums will become milk teeth later in pregnancy (Koussoulakou et al 2009, Moore et al 2019d, Visembryo ndc) .

Although it's not possible to tell the sex of your baby by ultrasound yet, his genitals have begun to form (Hill 2019d, Moore et al 2019e, Visembryo ndd) . His ankles and wrists are more developed and his fingers and toes are more clearly defined (Hill 2019d,e, Moore et al 2019b, Visembryo ndd, e) . His arms can bend at the elbows (Moore et al 2019f) and are long enough for his hands to rest on his chest, where they will soon meet (Mooney 2016, Moore et al 2019b, Visembryo ndb) .

Your baby's legs are lengthening and are more in proportion with the rest of his body. His knee and ankle joints are showing too (Moore et al 2019b, Visembryo nde) .

Until this point, your ovaries have been in charge of producing progesterone, a hormone that's essential for your growing baby (Moore et al 2019g) . However, the placenta has now developed enough to start taking over this critical job (Kumar and Magon 2012, Moore et al 2019g) . It's also nearly ready to deliver the nutrients your baby needs and clear waste substances from his body (Cole 2009, Moore et al 2019g, Weiss et al 2016) .

Check out our pregnancy guide to see what changes are in store for you at nine weeks pregnant.

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9: Week 9: The Human Body Biome - Biology

Central questions: How do human body systems interact to provide for the needs of the human organism? How do the systems of the body help regulate the internal environment? How can understandings human body systems help us make informed decisions regarding health?

  • I can describe how the complex set of systems found in the human body are made up of specialized cells that form tissues, organs, and organ systems.
  • I can explain the role of cells, tissues and organs in human body systems in carrying out a vital life function for the organism.

Week 04 - November 14

  • I can explain how the proper function of the excretory system helps the body maintain homeostasis.
  • I can explain how the muscular and skeletal systems work together to allow for support and movement.
  • I can describe the role of the endocrine and nervous systems in maintaining homeostasis.
  • PSA project sheet signed - due Monday, November 14
  • Field journal submission - due Monday, November 23
  • Human Body Systems TEST - due Tuesday, November 24
  • PSA project - due Tuesday, December 1

Week 03 - November 9

  • I can describe how the organs of the respiratory system work together to perform respiration.
  • I can describe how the organs of the cardiovascular system work together to transport and deliver nutrients to cells of the body.
  • The respiratory system - The function of the respiratory system is to facilitate gas exchange between the air and the blood.
  • Ventilation - The act of breathing (inspiration and expiration): moving air into and out of the lungs.
  • Respiration - Gas exchange!
  • Cardiovascular system - The function of the cardiovascular system is to move blood throughout the body in order to deliver oxygen and nutrients to all cells and take away waste from all cells.
  • Arteries - Large, muscular blood vessels that take blood away from the heart.
  • Veins - Large blood vessels that bring blood back to the heart.
  • Capillaries - Tiny blood vessels found in tissues that allow for gas and nutrient exchange between the cells of the body and the blood.
  • Respiratory system synthesis (field journal p36) - due Thursday, November 12.
  • Concept map week 3 update - due Monday, November 16
  • Week 3 exit ticket (digital) - due Monday, November 16
  • Signed project sheet - due Monday, November 16

Heart animation

Respiratory system animation

Week 02 - November 2

  • I can describe how the major organs of the digestive system contribute to its overall function.
  • I can describe the nutrients my body needs.
  • I can explain how food provides energy.
  • I can analyze the digestive system's function by tracing different foods through it!
  • The Digestive System - The function of the digestive system is to digest (break down) food into nutrients, absorb nutrients, and excrete (get rid of) the indigestible parts of food (waste).
  • Digest - To break down into smaller component parts.
  • Absorb (biology) - To take in materials through diffusion or active transport across the cell membrane.
  • Mechanical digestion - To break down (into smaller pieces) physically through movement.
  • Chemical digestion - To break down (into smaller pieces) chemically through chemical reactions that break apart molecules.
  • Enzyme - Special molecules that build or break down materials in the body. Enzymes aid in chemical digestion.
  • Digestive system flow chart (field journal) - due Tuesday, November 3
  • Follow your food (graphic organizer) - due Friday, November 6

Ted Ed - Tour of Digestion

PillCam - Endoscopy done using a camera in a pill capsule!

9: Week 9: The Human Body Biome - Biology

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    We love Sonlight because it teaches our children to think critically about what they are learning. It challenges them to carefully consider the worldview that the media and many of their friends hold. They are learning that the biblical worldview is supported by science (among other subjects) and they are learning how to defend their faith. Sonlight also breaks us free from the 'school at home' mindset by allowing a more relaxed learning environment and encouraging discussion rather than completing lots of worksheets. Thanks Sonlight! Here, twelve-year-old Mackenzie reads from Science G in her third year of Sonlight.

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    Prenatal Form and Function – The Making of an Earth Suit

    By the beginning of the fetal period, synapses, or connections between nerve cells, are found within the cerebral cortex.1 The fetal period continues until birth.

    By 9 weeks thumb sucking2 begins and the fetus may swallow amniotic fluid.3 The fetus can also grasp an object,4 move the head forward and back, open and close the jaw, move the tongue, sigh,5 and stretch.6

    By 9 weeks, the nerve receptors in the face, palms of the hands, and soles of the feet can sense and respond to light touch.7 Following a light touch on the sole of the foot, the fetus will bend the hip and knee and may curl the toes.8

    The eyelids fuse completely shut by 9 weeks.9

    The peristalsis previously restricted to the large intestine begins in the small intestine.10

    In female fetuses the uterus is identifiable by 9 weeks11 and, within the fetal ovary, immature germ cells called oogonia, are replicating via mitosis.12 Outside the body, the genitalia begin to differentiate as either male or female.13

    In the larynx, the appearance of vocal ligaments signals the onset of vocal cord development.14

    Watch the video: Life Science Vocabulary week 9 (November 2021).