Question

2. These are the chemical substances which are the secretions of
endocrine glands. -----------
3. The first menstrual flow that begins at puberty.------------
4. These glands secrete hormones which maintain the correct salt
balance in the blood.-----------​

Answer 1

Answer:

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• Hormones
• menarche
• adrenal glands

Answer 2

Answer:

(2) Endocrine glands - secrete chemical substances called hormones directly into the bloodstream for transport to target tissues. There are more than 20 steroid hormones in the body, ie. cortisol, cortisone, estrogen, progesterone, testosterone.

(3)The first menstrual cycle starts at puberty usually at the age of 12- 15 years of age and called menarche. Menarche mainly occurs in the body of females after the attainment of sufficient body mass. Menarche indicates that the female has attained reproductive maturity.

(4) So, aldosterone is the endocrine gland that secretes hormones that maintains correct salt balance in the blood

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