Because semen swims upstream. The bladder is not located above the vagina (internally). If the ejaculation takes place in the vagina, the semen will swim up towards the cervix.
Cerebrospinal fluid (CSF), clear, colourless liquid that fills and surrounds the brain and the spinal cord and provides a mechanical barrier against shock. Formed primarily in the ventricles of the brain, the cerebrospinal fluid supports the brain and provides lubrication between surrounding bones and the brain and spinal cord. When an individual suffers a head injury, the fluid acts as a cushion, dulling the force by distributing its impact. The fluid helps to maintain pressure within the cranium at a constant level.
https://www.britannica.com/science/cerebrospinal-fluid
C, Perfomance enhancing drugs. AKA steroids.
If this was the appropriate answer make sure to mark as the brainliest!
In the large intestine, or colon, salts and water are absorbed from the liquefied food, leaving a semi-solid residue called feces (stool). ... When the stool enters the rectum, stretching causes the muscles of the lower rectum and anus to relax so that the stool can be eliminated by defecation.
Explain the role of Calcium(Ca+) in askeletal muscle contraction. Role of calcium { Ca++}: By BONDING to the TROPONIN it causes the TROPOMYOSIN to MOVE from its blocking position on the active sites on the actin filaments SO the CROSS BRIDGES CAN ATTACH.
