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. The outermost layer of the digestive tract, which is composed of a thin layer of areola tissue:

A.

mucosa (mucous membrane)

B.

serosa (mesentery)

C.

muscularis externa

D.

Submucosa

Answer and Explanation

The Correct Answer is B

A. Mucosa (mucous membrane): The mucosa is the innermost layer of the digestive tract, not the outermost. It includes the epithelium, lamina propria, and muscularis mucosae. 

 

B. Serosa (mesentery): The serosa is the outermost layer of the digestive tract in parts where it is covered by peritoneum. It consists of a thin layer of areolar tissue topped by simple squamous epithelium.

 

C. Muscularis externa: The muscularis externa is a layer of muscle in the digestive tract, located beneath the serosa. It is not the outermost layer.

 

D. Submucosa: The submucosa is a layer of connective tissue located between the mucosa and muscularis externa. It is not the outermost layer.
 


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View Related questions

Correct Answer is A

Explanation

A. Luteinizing hormone (LH); testosterone: Luteinizing hormone (LH) stimulates the interstitial cells (Leydig cells) of the testes to produce and secrete testosterone.

B. Follicle-stimulating hormone (FSH); androgen-binding protein (ABP): Follicle-stimulating hormone (FSH) stimulates the Sertoli cells to produce androgen-binding protein (ABP), but it does not stimulate the interstitial cells to secrete testosterone.

C. Luteinizing hormone (LH); androgen-binding protein (ABP): Luteinizing hormone (LH) stimulates the secretion of testosterone, not androgen-binding protein (ABP). ABP is stimulated by FSH.

D. Luteinizing hormone (LH); estrogen: Luteinizing hormone (LH) stimulates the secretion of testosterone, not estrogen. Estrogen is primarily produced in females and also in males in smaller amounts.

Correct Answer is A

Explanation

A. K+: Potassium (K+) is the most abundant cation in the intracellular fluid (ICF). This is the correct answer.

B. Ca2+: Calcium (Ca2+) is not the most abundant cation in the ICF; it is found in lower concentrations within cells compared to potassium.

C. Cl-: Chloride (Cl-) is the most abundant anion in the extracellular fluid (ECF), not in the intracellular fluid.

D. Na: Sodium (Na) is the most abundant cation in the extracellular fluid (ECF), not in the intracellular fluid.

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