md0006 - BASIC HUMAN ANATOMY.pdf - Raems.com
md0006 - BASIC HUMAN ANATOMY.pdf - Raems.com
md0006 - BASIC HUMAN ANATOMY.pdf - Raems.com
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SOLUTIONS TO EXERCISES, LESSON 8<br />
1. The human urogenital systems are made up of the urinary organs, which produce<br />
the fluid called urine, and the genital, or reproductive, organs of male and female<br />
humans, which together can produce a new human. (para 8-1)<br />
2. The urinary system is specialized to remove certain nitrogenous waste products<br />
from the circulating blood. These result from the body's use of proteins.<br />
(para 8-2a)<br />
3. The major parts of the human urinary system are two kidneys, two ureters, one<br />
urinary bladder, and one urethra. (para 8-2b)<br />
4. On the concave, medial side of each kidney there is a notch called the hilus.<br />
Through this notch pass the ureter and the NAVL which service the kidney.<br />
(para 8-3a(2))<br />
5. If we <strong>com</strong>pare the structure of the kidney with that of a cantaloupe, the structure<br />
corresponding to the hard rind would be the renal cortex. The structure<br />
corresponding to the edible flesh of the melon would be the renal medulla.<br />
Corresponding to the hollow center (after removal of the seeds) would be the renal<br />
sinus. The pyramids of the renal medulla form peaks called papillae, which empty<br />
into the renal sinus. (para 8-3b)<br />
6. The functional unit of the human kidney is the nephron. Its main subdivisions are<br />
the renal corpuscle and a tubular system. (para 8-3c)<br />
7. The renal corpuscle is <strong>com</strong>posed of the glomerulus and the renal capsule. Blood<br />
enters by way of the afferent arteriole, passes through the tangled mass of<br />
capillaries called the glomerulus, and leaves by way of the efferent arteriole.<br />
Leaving the blood, fluid is first collected in the double-walled sac called the renal<br />
capsule. (para 8-3c)<br />
8. The first coiled portion of the renal tubule is known as the proximal convoluted<br />
tubule. The hairpin-shaped portion of the renal tubule is known as the renal loop<br />
(of Henle). The second coiled portion is known as the distal convoluted tubule.<br />
(para 8-3c(2))<br />
9. The distal convoluted tubules of several nephrons empty into a collecting tubule.<br />
The urine is then passed from the collecting tubule at the papilla of the medullary<br />
pyramid. Several collecting tubules are present in each pyramid. There is a<br />
hollow sac within the sinus of the kidney called the renal pelvis. The ureter then<br />
drains the urine from the renal pelvis. (paras 8-3d, e)<br />
10. Ureters are tubes which connect the kidneys to the urinary bladder. The<br />
mechanism used by ureters to move urine is peristalsis. (para 8-4)<br />
MD0006 8-19