Question 1

Paracrine hormones are usually secreted into the

Accepted Answer

A)  blood. 
B)  interstitial matrix. 
C)  digestive system. 
D)  lymph. 
E)  duodenum. 
A)  blood. 
B)  interstitial matrix. 
C)  digestive system. 
D)  lymph. 
E)  duodenum.

Question 2

Secretin

Accepted Answer

A)  is stimulated by the alkalinity of secretions from the pancreas. 
B)  regulates secretion from the islets of Langerhans in the pancreas. 
C)  operates as an antagonist of gastrin. 
D)  is secreted by S cells in the duodenum in response to a fall in pH and is controlled by a negative feedback mechanism. 
E)  is secreted into the intestine to stimulate digestion. 
A)  is stimulated by the alkalinity of secretions from the pancreas. 
B)  regulates secretion from the islets of Langerhans in the pancreas. 
C)  operates as an antagonist of gastrin. 
D)  is secreted by S cells in the duodenum in response to a fall in pH and is controlled by a negative feedback mechanism. 
E)  is secreted into the intestine to stimulate digestion.

Question 3

Which of the following statements about hormones is NOT true? Hormones

Accepted Answer

A)  allow responses to changes in the environment. 
B)  act at low concentration. 
C)  initiate cellular activities. 
D)  are secreted in response to specific stimuli. 
E)  are classified with respect to the distances over which they act. 
A)  allow responses to changes in the environment. 
B)  act at low concentration. 
C)  initiate cellular activities. 
D)  are secreted in response to specific stimuli. 
E)  are classified with respect to the distances over which they act.

Question 4

In male mammals, luteinising hormone (LH)

Accepted Answer

A)  stimulates spermatogenesis. 
B)  secretion is inhibited by inhibin. 
C)  stimulates formation of the corpus luteum. 
D)  stimulates absorption of amino acids and protein. 
E)  stimulates the secretion of androgens. 
A)  stimulates spermatogenesis. 
B)  secretion is inhibited by inhibin. 
C)  stimulates formation of the corpus luteum. 
D)  stimulates absorption of amino acids and protein. 
E)  stimulates the secretion of androgens.

Question 5

In animals, gonadotrophic hormones

Accepted Answer

A)  stimulate the gonads to produce gametes. 
B)  inhibit sexual maturation. 
C)  stimulate spawning. 
D)  are produced by the ovaries and testes. 
E)  are released from the hypothalamo-hypophyseal portal-system. 
A)  stimulate the gonads to produce gametes. 
B)  inhibit sexual maturation. 
C)  stimulate spawning. 
D)  are produced by the ovaries and testes. 
E)  are released from the hypothalamo-hypophyseal portal-system.

Exam 28: Hormonal Control in Animals

Paracrine hormones are usually secreted into the

Secretin

Which of the following statements about hormones is NOT true? Hormones

In male mammals, luteinising hormone (LH)

In animals, gonadotrophic hormones

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