This week's top television picks includes a three-part series looking into how the human body works, new military drama The Last Post, the return of Doc Martin and The Last Leg, and a BBC documentary Horizon: Being Transgender.
Factual: The Human Body: Secrets of Your Life Revealed
BBC Two, 9pm
In the first episode of the three-part series, Chris and Xand Van Tulleken explore the latest research into how humans grow and the dramatic changes the body goes through.
The twins uncover why humans experience childhood longer than any other creature on Earth, and look at the incredible power of breast milk.
With cutting-edge science and special effects, the programme shows intricate details of the formation of the human body, including the fascinating moment an egg fertilises with sperm.
Documentary: Horizon: Being Transgender
BBC Two, 9pm
This documentary explores gender identity and the psychological, physical and biological effects transitioning from one gender to another can have on a person.
Experts in the field of gender reveal how modern medicine is helping people to transition their gender alongside personal accounts of transgender people transitioning.
Horizon: Being Transgender follows different transgender people going through their own experience, including a socially transitioning transwoman, two young transmen starting hormone treatment, and a transwoman going through gender confirmation surgery.
Comedy Drama: Doc Martin
Louisa (Caroline Catz) has an urge to change her career path after she helps diagnose a pupil, although how does Martin (Martin Clunes) feel about her new found ambition?
Elsewhere, upon arriving in the village to scatter his father's ashes, John Rahmanzai (Art Malik) discovers Ruth Ellingham (Eileen Atkins) knew his dad...and quite a lot better than he did.
Entertainment: The Last Leg
Adam Hills, Alex Brooker and Josh Wiidicombe are back for another dose of weekly entertainment for the twelfth series of The Last Leg.
With the usual run down of the week's biggest news and topical debates, the boys deliver a light-hearted look at the previous seven days with guests Joanna Lumley and Russel Howard.
Drama: The Last Post
The Last Post goes back to the sixties in this army drama based on writer Peter Moffat's childhood experiences growing up in a military family.
Set in Aden, Yemen, the drama begins with the arrival of newlyweds Honor, played by Jessie Buckley (War and Peace), and her husband RMP Captain Joe Martin, played by newcomer Jeremy Neumark-Jones.
As the young couple adjust to life in the dangerous new environment, Honor begins to question whether she really knows the man she has married and becomes immersed in the closed knit army community, befriending the funny and direct Alison (Jessica Raine - Call the Midwife).
Other stars include Amanda Drew (Broadchurch), Ben Miles (The Crown) and Stephen Campbell Moore (History Boys).