Action Females: Small quantities of androgenic (masculinizing) hormones from adrenal glands cause growth of pubic and axillary hair at puberty; most androgens, such as testosterone, are converted to estrogen.
Which hormone induces the growth of pubic and axillary hair at puberty?
In both girls and boys, puberty is associated with an increase in adrenal androgen production. This “adrenarche” contributes to pubertal maturation, particularly growth of axillary and pubic hair. Androgens also are needed for the development of the male reproductive system.
Are the undifferentiated germ cells in the testes that begin to divide mitotically at puberty?
The undifferentiated germ cells, called spermatogonia (singular, spermatogonium), begin to divide mitotically at puberty.
Which of the following hormones are examples of Gonadotropic hormones select all that apply?
Gonadotropins: Luteinizing and Follicle Stimulating Hormones. Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) are called gonadotropins because stimulate the gonads – in males, the testes, and in females, the ovaries. They are not necessary for life, but are essential for reproduction.
Which hormone induces growth of pubic hair?
At about the same time, the adrenal glands of both boys and girls begin to produce a group of hormones called adrenal androgens. These hormones stimulate the growth of pubic and underarm hair in both sexes.
What is the androgen hormone?
Androgens are the group of sex hormones that give men their ‘male’ characteristics (collectively called virilisation). The major sex hormone in men is testosterone, which is produced mainly in the testes.
What does T3 and T4 target?
The cells of the developing brain are a major target for T3 and T4. Thyroid hormones play a particularly crucial role in brain maturation during fetal development by regulating actin polymerization during neuronal development.
What is follicular stimulating hormone?
Follicle stimulating hormone is one of the hormones essential to pubertal development and the function of women’s ovaries and men’s testes. In women, this hormone stimulates the growth of ovarian follicles in the ovary before the release of an egg from one follicle at ovulation.
What stimulates LH?
In males, LH stimulates testosterone release by the Leydig cells of the testes. In females, LH stimulates steroid release from the ovaries, ovulation, and the release of progesterone after ovulation by the corpus luteum .
What is the origin of primordial germ cells?
Primordial germ cells originate in the endoderm of the yolk sac and migrate to the genital ridge to form the indifferent gonad. 46, XY and 46, XX gonads are initially indistinguishable. Indifferent gonads develop into testes if the embryo, or more specifically the gonadal stroma, is 46, XY.
What is Type A and Type B spermatogonia?
There are three subtypes of spermatogonia in humans: Type A (dark) cells, with dark nuclei. These cells are reserve spermatogonial stem cells which do not usually undergo active mitosis. … Type B cells, which undergo growth and become primary spermatocytes.
What is primordial cells?
In humans, the primordial germ cell (PGC) is the primary undifferentiated stem cell type that will differentiate towards gametes: spermatozoa or oocytes.
What is posterior pituitary?
The posterior pituitary (or neurohypophysis) is the posterior lobe of the pituitary gland which is part of the endocrine system. The posterior pituitary is not glandular as is the anterior pituitary.
What gland secretes T3 and T4?
The thyroid gland uses iodine from food to make two thyroid hormones: triiodothyronine (T3) and thyroxine (T4). It also stores these thyroid hormones and releases them as they are needed. The hypothalamus and the pituitary gland, which are located in the brain, help control the thyroid gland.
Which one is a Gonadotropic hormone?
Gonadotrophs, cells that constitute about 10 percent of the pituitary gland, secrete two primary gonadotropins: luteinizing hormone (LH) and follicle-stimulating hormone (FSH).