Brain Stimulation and MRI Scanning Techniques

What is the main function of the endocrine system in the human body?

Secrete hormones into the bloodstream for slower, long-term communication

Which mechanism is activated when the body temperature decreases too much?

Skeletal muscles contracting rapidly (shivering)

What role does vasoconstriction play in heat regulation?

Decreases heat loss by reducing blood flow near the skin surface

How does vasodilation contribute to maintaining body temperature?

Increases blood flow near the skin surface for more heat loss Signup and view all the answers

Which communication system in the human body involves chemical messengers?

Endocrine system Signup and view all the answers

What happens when sweat evaporates from the skin surface?

Increased energy transfer away from the body Signup and view all the answers

What is the purpose of reflexes in the body?

To coordinate appropriate responses quickly Signup and view all the answers

What is the function of effectors in the nervous system?

Executing responses such as muscle contractions Signup and view all the answers

What is the role of synapses in neural communication?

Trigger the start of an impulse in the next neuron Signup and view all the answers

Why does a reflex arc differ from a usual conscious response?

It allows vital responses to occur quickly Signup and view all the answers

Which statement accurately describes the journey of an impulse in a reflex arc?

From sensory neuron to relay neuron to effector Signup and view all the answers

In neural communication, what triggers the release of a chemical into the synapse?

Impulse reaching the end of the neuron Signup and view all the answers

What is the role of electrically stimulating different parts of the brain?

Providing information on the function of specific brain areas Signup and view all the answers

Which part of the eye carries impulses from the retina to the brain?

Optic nerve Signup and view all the answers

What is the main function of the cornea in the eye?

To transmit light onto the retina Signup and view all the answers

What is the purpose of MRI scanning techniques in relation to the brain?

To show which part of the brain is affected by a tumour Signup and view all the answers

What happens when light hits the retina of the eye?

Impulses are sent to the brain Signup and view all the answers

What structure in the eye is responsible for bending and focusing light onto the retina?

Cornea Signup and view all the answers

What happens to the muscles surrounding the pupil in bright light?

Circular muscles relax and radial muscles contract Signup and view all the answers

What is the role of ciliary muscles and suspensory ligaments in controlling the shape of the lens?

Ciliary muscles control the lens shape while suspensory ligaments hold it in place Signup and view all the answers

What occurs when ciliary muscles contract and suspensory ligaments loosen?

Lens becomes thicker and more curved Signup and view all the answers

Which eye defect is characterized by distant objects appearing blurry?

Myopia Signup and view all the answers

In dim light, what happens to the circular and radial muscles surrounding the pupil?

Circular muscles contract and radial muscles relax Signup and view all the answers

What is the effect of suspensory ligaments tightening and ciliary muscles relaxing on the lens?

Lens becomes thinner Signup and view all the answers

What is the primary function of dialysis in treating kidney failure?

Removing waste products from the blood Signup and view all the answers

Why is it mentioned that dialysis has to be done three times a week?

To ensure continuous removal of waste products from the blood Signup and view all the answers

What are some drawbacks of undergoing dialysis treatment?

Requirement for strict diet control Signup and view all the answers

Why is a kidney transplant considered the only cure for kidney failure?

It addresses the root cause of kidney failure Signup and view all the answers

How does a kidney transplant differ from dialysis in terms of long-term treatment effects?

It is more cost-effective than dialysis overall Signup and view all the answers

What is one significant advantage of having two kidneys instead of only one for human survival?

Redundancy in case of acute kidney failure Signup and view all the answers