STD 11 - 17. Locomotion and movement — NEET STD 11 Science — Question

If a person is suffering from severe male infertility due to very few sperms (oligozoospermia) or even no live sperms (azoospermia) in the ejaculate, it can be overcome by ________. This should offer couples an alternative to using donor sperm

Pheretima is

Human beings are

Transplantation of tissues/organs fails often due to non­acceptance by the patient’s body. Which type of immune response is responsible for such rejections?

Lactational amenorrhea prevents

Which of the following sequences is correct to initiate expiration ?
(i) Relaxation of external intercostals muscles and return of diaphragm and sternum to their normal position.
(ii) Air expelled from lungs.
(iii) Volume of thorax decreases.
(iv) Intrapulmonary pressure increases.

If a man who is colour blind marries a women, who is pure normal for colour vision, the chances of their sons have colour blindness is

Which of the following statements are correct for regulation of cardiac activity ?
(i) A special neural centre in the medulla oblongata can moderate the cardiac function through autonomic nervous system.
(ii) Neural signals through the sympathetic nerves can increase the rate of heart beat, the strength of ventricular contraction and thereby the cardiac output.
(iii) Parasympathetic neural signals decrease the rate of heart beat, speed of conduction of action potential and thereby the cardiac output.
(iv) Adrenal medullary hormones can also increase the cardiac output.
(v) Adrenalin or epinephrine increase heart beat.
(vi) Acetylcholine decrease heart beat.