相关实验视频

Updated: Jun 26, 2026

Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid
09:09

Protocol for Assessing the Relative Effects of Environment and Genetics on Antler and Body Growth for a Long-lived Cervid

Published on: August 8, 2017

皮质和益生菌的时间协同作用控制了乌的淋巴腺生长

A H Meier, D D Martin, R MacGregor

    Science (New York, N.Y.)
    |September 24, 1971
    PubMed
    概括

    皮质和益生菌的时间调节了鸟类的生殖周期. 这些激素的特殊注射时间表控制着生殖腺的生长,影响着鸟类的季节性生殖状态.

    更多相关视频

    Gonadectomy and Blood Sampling Procedures in the Small Size Teleost Model Japanese Medaka (Oryzias latipes)05:31

    Gonadectomy and Blood Sampling Procedures in the Small Size Teleost Model Japanese Medaka (Oryzias latipes)

    Published on: December 11, 2020

    Limited Bedding and Nesting as a Model for Early-Life Adversity in Mice04:20

    Limited Bedding and Nesting as a Model for Early-Life Adversity in Mice

    Published on: July 12, 2024

    相关概念视频

    Hypothalamic-Pituitary Axis01:37

    Hypothalamic-Pituitary Axis

    The response to stress—be it physical or psychological, acute or chronic—involves activation of the Hypothalamic-Pituitary-Adrenal (HPA) axis. The HPA axis is part of the neuroendocrine system because it involves both neuronal and hormonal communication. Its function is to regulate homeostatic systems—metabolic, cardiovascular, and immune—providing the necessary means to respond to a stressor.
    Regulation of Hormone Secretion01:19

    Regulation of Hormone Secretion

    Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
    Humoral stimuli,...
    Hormones of the Pituitary Gland01:27

    Hormones of the Pituitary Gland

    The small, pea-sized pituitary gland is located at the base of the brain. It is crucial in regulating various bodily functions, from growth to reproduction. The gland is divided into the anterior lobe and the posterior lobe. The secretory cell clusters in the pars distalis of the anterior pituitary lobe are controlled by hypothalamic regulators and synthesize six primary hormones.
    The most abundantly secreted hormone from the anterior lobe is the growth hormone, which controls overall growth by...
    Gonadal and Placental Hormones01:24

    Gonadal and Placental Hormones

    The gonads, namely the testes in males and the ovaries in females, are pivotal in producing gonadal hormones that orchestrate the intricate processes of sexual development and reproduction.
    In males, testosterone is the primary gonadal androgen. It plays a central role in the maturation of male reproductive organs — the penis and testes. Additionally, testosterone is instrumental in the development of secondary sexual characteristics — a deep voice as well as facial and pubic hair growth — and...
    Hormonal Control of the Ovarian Cycle01:30

    Hormonal Control of the Ovarian Cycle

    The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
    Before puberty, the hypothalamus releases GnRH in a low frequency, low amplitude pulsatile manner. This along with the immature hypothalamic-pituitary-gonadal axis activity, results in low estrogen levels and the absence of a fully functional ovarian cycle.  At puberty, GnRH secretion increases in both frequency and...
    Signs of Puberty01:27

    Signs of Puberty

    Puberty is a critical phase, typically beginning between the ages of 8 and 13 in girls and 9 and 14 in boys, though timing can vary based on genetics, environmental factors, and overall health. This period is characterized by the development of secondary sexual characteristics and the attainment of reproductive potential. Endocrine changes underpin puberty, with hormonal surges of Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) instigated by Gonadotropin-Releasing Hormone (GnRH)...