Structure and Function - Feedback mechanisms maintain a living system’s internal conditions within certain limits and mediate behaviors, allowing it to remain alive and functional even as external conditions change within some range. Feedback mechanisms can encourage (through positive feedback) or discourage (negative feedback) what is going on inside the living system

Study the following flow chart. Choose the correct sequence of hormones involved at each stage:

The principal nitrogenous excretory compound in humans is synthesized

Assertion: Light is a very important factor in transpiration.

Reason: Light induces stomatal opening and darkness closing of stomata. Therefore, transpiration increases in light and decreases in dark.

Weberian ossicles are found in:

Assertion: Lateral line system is found in fishes and aquatic larval amphibians.

Reason : Lateral line system has receptor of sensory cells derived from ectoderm.

What is vital capacity of our lungs ?

Stress is reduced by:

Which of the following hormones interact with membrane bound receptors and generate second messenger inside the cell to regulate metabolism?

A. GnRH and Somatostatin

B. FSH and LH

C. Cortisol and Estradiol

D. ANF and Thymosin

E. Thyroid hormones

Match List I and List II

Choose the correct answer from the options given below: 

Malonate inhibits the growth of pathogenic bacteria by inhibiting the activity of:

Which of the following options are correct?

A. An excessive loss of body fluid from the body switches off osmoreceptors.

B. ADH facilitates water reabsorption to prevent diuresis

C. ANF causes vasodilation

D. ADH causes increase in blood pressure

E. ADH is responsible for decrease in GFR.

Choose the correct answer from the options given below:

Which of the following are NOT under the control of thyroid hormone?

A. Maintenance of water and electrolyte balance

B. Regulation of basal metabolic rate

C. Normal rhythm of sleep-wake cycle

D. Development of immune system

E. Support the process of R.B.C.s formation

Choose the correct answer from the given options:

In the mechanism of hormone action that relies on signal transduction pathways and second messenger

Sea lions are mammals that live in the seas.

Some common features of sea lions are:

• A streamlined body.
• Whiskers on the face.
• Short fur on the body.
• Limbs shaped like flippers.
• A layer of fat under the belly.

What does the picture show about sea lions?

Human Chorionic Gonadotropin :

Secretin is secreted by

Statement I: The juxta-glomerular cells of kidney produce a steroid hormone called erythropoietin which stimulates erythropoiesis.

Statement II: Secretin acts on the endocrine pancreas & stimulate secretion of water & bicarbonate ions.