Excretion The final function of the digestive system is the excretion of waste

Excretion the final function of the digestive system

This preview shows page 17 - 19 out of 19 pages.

Excretion The final function of the digestive system is the excretion of waste in a process known as defecation. Defecation removes indigestible substances from the body so that they do not accumulate inside the gut. The timing of defecation is controlled voluntarily by
Image of page 17
the conscious part of the brain, but must be accomplished on a regular basis to prevent a backup of indigestible materials. From < > There are several functions of the Urinary System: Removal of waste product from the body (mainly urea and uric acid ) Regulation of electrolyte balance (e.g. sodium , potassium and calcium ) Regulation of acid-base homeostasis Controlling blood volume and maintaining blood pressure From < > The urinary system , also known as the renal system , consists of the kidneys , ureters , bladder , and the urethra . Each kidney consists of millions of functional units called nephrons . The purpose of the renal system is to eliminate wastes from the body, regulate blood volume and blood pressure, control levels of electrolytes and metabolites, and regulate blood pH. The kidneys have an extensive blood supply via the renal arteries which leave the kidneys via the renal vein. Following filtration of blood and further processing, wastes (in the form of urine ) exit the kidney via the ureters, tubes made of smooth muscle fibers that propel urine towards the urinary bladder, where it is stored and subsequently expelled from the body by urination ( voiding ). The female and male urinary system are very similar, differing only in the length of the urethra. [1] Urine is formed in the kidneys through a filtration of blood . The urine is then passed through the ureters to the bladder, where it is stored. During urination, the urine is passed from the bladder through the urethra to the outside of the body. 800–2,000 milliliters (mL) of urine are normally produced every day in a healthy human. This amount varies according to fluid intake and kidney function. From < > B. What are the structures of the digestive system? Oral cavity/mouth (lips, hard and soft palates, salivary glands, tongue, teeth and periodentium) Pharynx (epiglottis) Esophagus Stomach (rugae, pylorus, pyloric sphincter) Small intestine (duodenum, jejunum, ileum) Large intestine (cecum and colon (ascending colon, transverse colon, descending colon, sigmoid colon) Rectum and anus Liver, gallbladder, pancreas (accessory digestive organs) C. What are the structures of the urinary system? Kidneys (renal cortex, medulla, nephrons) Renal pelvis Ureter Bladder Urethra (urinary sphincter, meatus, female/male urethra, prostate)
Image of page 18
From < (NEXT(15847e31d9b34af7b75f481037b05310))/Main/CourseMode/Thread/ListThreadsView.ed? courseItemSubID=873190172&courseItemType=CourseContentItem&TopicID=7000009651552& >
Image of page 19

You've reached the end of your free preview.

Want to read all 19 pages?

  • Summer '16

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes