21. These hormones are amino acid based hormones and are released from the hypot
ID: 3523166 • Letter: 2
Question
21. These hormones are amino acid based hormones and are released from the hypothalamus and either increase or decrease the release of hormones from the anterior pituitary:
a) releasing hormones (factors)
b) inhibiting hormones (factors)
c) all of the above
22. What is true about second messengers:
a) are used by fat soluble, hydrophobic hormones and open ion channels in the membrane like a neurotransmitter does
b) are used by water soluble, hydrophilic hormones and activate kinase enzymes that phosphorylate proteins
23. Steroid hormones, that are hydrophobic, (fat soluble), like testosterone are more likely to have their receptors located in the:
a) nucleus or cytoplasm
b) cell membrane
24. Choose the correct statement:
a) there is a nervous connection between the hypothalamus and posterior pituitary and a blood portal circulation between the hypothalamus and anterior pituitary
b) there is a nervous connection between the hypothalamus and anterior pituitary and a blood portal circulation between the hypothalamus and posterior pituitary
25. What is true about the portal circulation between the hypothalamus and anterior pituitary:
a) hypothalamus makes releasing and inhibiting hormones and puts them in portal vessels
b) capillaries in the hypothalamus becomes venules/veins- venules/veins become capillaries again in the anterior pituitary
c) the portal circulation here allows something made in the hypothalamus to be released in the anterior pituitary
d) all of the above
Explanation / Answer
21) answer is c all the above
Releasing hormones and inhibiting hormones from hypothalamus regulates release of pituitary hormones.
22) answer is a
As they cannot cross lipid membrane,therefore generate secondary messangers which help in signal transduction.
23) answer is a
Receptors of steroid or thyroid hormones are located intracellularly,either in nucleus or cytoplasm.
24) correct answer is a)
It is these connections which allows transmission of releasing hormones or inhibiting hormones.
25)correct answer is d)
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