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Where and how does filtrate originate in the vertebrate kidney, and by what two routes do the components of the filtrate exit the kidney?

Short Answer

Expert verified

The filtrate is formed in the kidney’s filtering unit, such as the glomerulus. Then it passes to the loop of Henle to get transferred to a collecting duct for filtrate reabsorption into the living body before urine formation.

Step by step solution

01

Vertebrate

The term vertebrate refers to those species of animals whose bodily structure is protected with the help of a backbone.

The anatomical structures of vertebrate animals include internal skeleton (bone and cartilage), axial skeleton (rib cage, skull, and vertebral column), notochord, pharyngeal slits, and appendicular skeleton (pelvic girdle, limb bones, and shoulders).

The primary functions of the vertebral column found in vertebrates are spinal cord protection and body stiffening.

02

Kidney

The paired bean-shaped structure that acts as a natural excretory organ found under the ribcage of living beings is called the kidney.

Some of the functions of kidney are rennin synthesis, inorganic ions regulation, regulation of RBCs production, controlling water balance, activating vitamin D, controlling blood pressure, influencing blood ph, toxin removal, erythropoiesis, and maintenance of electrolyte balance.

The anatomy of kidneyincludes ureters, renal calyxes, and two distinct kidney zones like the inner medulla and outer cortex.

03

Kidney filtrate

The fluid that contains excretory material, water, salt, and amino acids that are filtered from the blood with the help of the glomerulus constitutes the production of filtrate.

The Bowman’s capsule that surrounds the glomerulus helps in blood filtration from the renal artery (supply blood to the kidney).

The filtrate in the renal tubule gets reabsorbed for its recovery and then passes to the renal vein to return blood from the kidney to the heart. The remaining filtrate content will be passed to the kidney in the ureters allowing the urine flow.

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Most popular questions from this chapter

The marine iguana (Amblyrhynchus cristatus), which spends long periods underwater feeding on seaweed, relies on both salt glands and kidneys for homeostasis of its internal fluids. Describe how these organs together meet the particular osmoregulatory challenges of this animal’s environment.

Which of the following animals generally has the lowest volume of urine production?

(A) vampire bat

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(C) marine bony fish

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Kidney failure is often treated by hemodialysis, in which blood diverted out of the body is filtered and then allowed to flow on one side of a semipermeable membrane. A fluid called dialysate flows in the opposite direction on the other side of the membrane. In replacing the reabsorption and secretion of solutes in a functional kidney, the makeup of the starting dialysate is critical. Which initial solute composition would work well?

The high osmolarity of the renal medulla is maintained by all of the following except

(A) active transport of salt from the upper region of the ascending limb.

(B) the spatial arrangement of juxtamedullary nephrons.

(C) diffusion of urea from the collecting duct.

(D) diffusion of salt from the descending limb of the loop of Henle.

You are exploring kidney function in kangaroo rats. You measure urine volume and osmolarity, as well as the amount of chloride (Cl-) and urea in the urine. If the water source provided to the animals were switched from tap water to a 2% NaCl solution, indicate what change in urine osmolarity you would expect. How would you determine if this change was more likely due to a change in the excretion of Cl- or urea?

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