Question

31) Sympathetic nerve stimulation and epinephrine heart activity. A) increase B) decrease C) have no effect on D) The heart responds to hormones, but not to nerve stimulation. E) The heart responds to nerve stimulation, but not to hormones.

Please answer all questions. Thank You?

Answer 1

31) option c. Sympathetic nervous system control body's involuntary action during danger or in any stressfull situation. Sympathetic nerves constrict blood vessels due to which pressure increases. Sympathetic nerves are present throughout the atria mainly in SA node. Thus sympathetic stimulation increase heart rate.

Epinephrine is also called as adrenaline. It is secreted by adrenal glands. It is released in dangerous or fearful situations. Epinephrine causes constriction of minute blood vessels. In heart it causes constriction with more force and in more rate resulting in release of more blood and thus increasing heart activity.

32)option c. Increased heart beat due to inflammation of heart cells.

33)option c. Sympathetic nervous system give fight or flight response when body is stressed. SNS give signal to adrenal gland to release adrenaline and cortisol which increase the heart beat. As here exam is stressfull situation thats why SNS causes increased heart beat.

Parasympathetic nervous system is opposite of sympathetic nervous system. It slow down the body function.

34) Here it seems all options are correct. In option a, plasma consist of 95%of water and 6-8% of ions, proteins, dissolved gased,nutrient molecules etc.

In option b, haemoglobin, a protein of rbc help in transport of oxygen.

In option c, wbc contains neutrophils and monocytes which can phagocytose the foreign organism, lymphocytes create antibodies against pathogen,eosinophil kill pathogen, basophils secret chemical like histamine which is a marker of allergic response.