Answer:
The correct option is : a. causing threshold to be reached more quickly
Explanation:
Norepinephrine, also known as noradrenalin, is an organic compound, which belongs to the catecholamine family. It acts as a hormone and a neurotransmitter in the brain and the body and also impacts the heart.
It is one of the hormones secreted by the adrenal medulla. Norepinephrine is a part of the fight-or-flight mechanism of the body. It acts by binding to the β-1 receptors and opens the chemical or ligand gated calcium and sodium ion channels. Therefore, <u>it causes the threshold to be reached faster </u>by increasing the rate of depolarization and thus causes heart arrhythmia.
Therefore, <u>Norepinephrine acts on the heart by </u><u>causing threshold to be reached faster.</u>
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These include the paired ovaries, paired uterine tubes, uterus (uterine horns), cervix, vagina, and the mammary glands. The ovaries are both an exocrine organ producing cells, i.e., ova, and an endocrine organ, secreting hormones, i.e., estrogen and progesterone.
Answer:
calcium channel close.
Explanation:
In action potential there is phase 0, phase 1, phase 2, phase 3 and phase 4. In phase 3 of action potential there is a rapid repolarization phase in which calcium channels remain closed but potassium channels remain open and continuous outward movement or leakage of positive ions causes the outside environment positive and membrane potential goes to negative charge that is -85mV to -90mV
Answer:
C
Explanation:
If you look up diagrams and parts of a nerve cell, it is there.
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Stage 1: Cervical Dilation. The first step in the calving process is cervical dilation or in simpler terms; a relaxation of the muscles keeping the uterus closed to keep the calf inside and everything else outside. ...
Stage 2: Foetal Expulsion (Calving) ...
Stage 3: Placental Expulsion (Afterbirth)
