These are the deep ridges in the gastric mucosa.

This is the valve which is responsible for limiting entry of food from the esophagus into the stomach.

These are the deep ridge-like folds of the small intestine which give the appearance of a corrugated tube.

This is the one  salivary gland which secretes a purely serous product.

This is the long seam-like stretch of smooth muscle that is responsible for producing the bulging ripples of the large intestine.

This is the structure which includes the glomerular capsule with its enclosed glomerulus.

This is cavity in the renal medulla in which the renal pelvis sits.

This is the small cup-like structure into which fluid from each renal pyramid drains.

  
These are the blood vessels  which form a spider web-like pattern around the nephron and emanate from the efferent arteriole. 
 

  
This is the artery within the kidney which turns to travel along the corticomedullary border. 
 

This is the gland which is capable of taking up and incorporating dietary iodine into a hormone. 
 
 

This is the hormone released by pancreatic alpha cells. 

This gland secretes a hormone which lowers plasma calcium levels. 
 
 
 

This is one of the glands which is actually two endocrine glands in one.

A portion of this gland can be thought of as an extension of the ANS.

Air moves through the nasal turbinates and sinuses to be warmed to body temperature and cleaned.  This is another important purpose of these airways.

This lung is composed of only two lobes and contains a cardiac notch.

The alveolus is lined by this tissue type, which guarantees rapid diffusion of gases.

This is the primary bronchus which is slightly more vertical, lending itself to be the more likely side for lodging aspirated food.

This is the structure which closes off the larynx to aspirated food particles.

These are the tubules of the testes in which sperm cells mature.

This is the name for the most rudimentary sperm cells, and are diploid in number.

This is the tubular structure into which fully formed sperm  move, and wait until such time as they are ejaculated. 

This are the structures responsible for capturing the ovulated egg once it is in the peritoneal cavity.

This is the name for the wave-like contractions which propel both the sperm and egg down the tubular reproductive structures.  It also is a term for a form of  motility seen in the gastrointestinal tract.